Best Sonic Boom Alarm Clocks

More on uscce Loud Dual Alarm Clock with Bed Shaker - 0-100% Dimmer, Vibrating Alarm...

• SMALL BUT MIGHTY - If it takes an earthquake or siren to wake you up, this classically designed clock is exactly what you are looking for. The 3-level adjustable shaker is perfect for heavy sleeper or those with hearing loss. You also have the option to combine the vibration with the built-in alarm sound (buzzer, bird or music).
• EASY TO SETUP - Turning the two “ears” to set the time and alarm is extremely intuitive and straightforward. With all buttons clearly labeled and almost no two functions sharing the same button, it is a breeze to use right out of the box and change settings.
• CUSTOMIZABLE ALARM - The brightness of the classic is dial-controlled and adjustable from 0 to 100%. Dual alarms satisfy the need of anyone who shares the bed with a partner on a different morning schedule. Snooze allows extra 9 minutes of slumber.
• USB PORTS AND BATTERY BACKUP - 1 USB port located at the back will charge your mobile device while you sleep. AC-powered, but you have the option to back it up with 2 AAA batteries (NOT included) in case of power outage. Not only time and settings are restored, but alarms are also supported (vibration and USB will not work).
• If you have any questions or comments, please don’t hesitate to contact us - we are always here to help.

More on Sonic Boom Alarm Clock,Extra Loud Vibrating Dual Alarm Clock,Digital Alarm...

Features 3 alarm modes available, including ring, vibrate, ring and vibrate. Dual USB charging ports, can be used to power different devices at the same time. 4.75" vibrator cable is long enough to put under your pillow, wakes you up easily. Unique snooze function, allows you to set snooze time from 1 minute to 30 minutes. 3.74" digital display, continuously adjustable brightness and volume control. Specification: -Color:Black -Material:ABS -Alarm Clock size:14.5x15x6.5cm -Vibrator size:10.5x3.9x10.5cm -Screen size:3.74" -Battery:3x AAA Battery(Not included) -Power cord length:1m/3.3" -Vibrator cable length:1.45m/4.75" Package List: 1x Alarm Clock 1x Vibrator loud alarm clock for heavy sleepers loud alarm clock alarm clock for heavy sleepers vibrating alarm clock for heavy sleepers sonic boom alarm clock bed shaker alarm clock super loud alarm clock for heavy sleepers adults loudest alarm clock

More on Extra Loud Vibrating Alarm Clock with Bed Shaker for Heavy Sleeper Deaf Hard...

• 🔊 WAKE UP ON TIME WITH SUPER BED SHAKER: You may easily sleep through your alarms with a regular alarm sound, try this 𝗩𝗶𝗯𝗿𝗮𝘁𝗶𝗻𝗴 𝗔𝗹𝗮𝗿𝗺 𝗖𝗹𝗼𝗰𝗸 - an effective alternative for those who are very hard of hearing. 3 Awake Modes: bed shaker, buzzer, bed shaker&buzzer to choose. The 𝘃𝗶𝗯𝗿𝗮𝘁𝗶𝗻𝗴 𝘀𝗵𝗮𝗸𝗲𝗿 alert is a wired vibrator connected to clock and placed near you, when alarm goes off, the vibrator will shake to awaken you without disturbing other.
• 🔊 7" LARGE SCREEN WITH ADJUSTABLE DIMMER & VOLUME: This 𝗹𝗼𝘂𝗱 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 𝗳𝗼𝗿 𝗵𝗲𝗮𝘃𝘆 𝘀𝗹𝗲𝗲𝗽𝗲𝗿𝘀 also equipped with a 7 inch centered illuminating jumbo display, numbers are VERY easy to read without having to put on glasses, especially helpful for people who have poor eyesight. 3 levels (Low-Medium-High) alarm volume and full range (0-100%) brightness of display can be adjusted at any time to your preference.
• 🔊 7 COLORED NIGHT LIGHT & BIG SNOOZE BUTTON: This 𝗯𝗲𝗱𝗿𝗼𝗼𝗺 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 comes with a bigger than average 𝗻𝗶𝗴𝗵𝘁 𝗹𝗶𝗴𝗵𝘁 which is a great add-on feature to work as a bedside lamp at night. Press the big “SNOOZE” button on the top when the alarm sounds rings to snooze for another 9 minutes. But don't worry, the alarm will ring every next 9 minutes unless you press the "ALARM PAUSE" button.
• 🔊 OUTLET OPERATED WITH BATTERY BACKUP: This 𝗯𝗲𝗱 𝘀𝗵𝗮𝗸𝗶𝗻𝗴 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 is 𝗼𝘂𝘁𝗹𝗲𝘁 𝗼𝗽𝗲𝗿𝗮𝘁𝗲𝗱 for ALL functions working such as USB charging, vibration, alarm, and time display. 2 AAA batteries (not included) are only used to back-up your time and alarm settings as well as trigger the alarm when power failure.
• 🔊 DUAL CELLPHONE CHARGERS, 12/24 H, DST: This 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 𝗳𝗼𝗿 𝗵𝗮𝗿𝗱 𝗼𝗳 𝗵𝗲𝗮𝗿𝗶𝗻𝗴 is 𝗲𝗮𝘀𝘆 𝘁𝗼 𝘀𝗲𝘁 time, alarm, and other practical functions. 𝟮 𝗽𝗵𝗼𝗻𝗲 𝗰𝗵𝗮𝗿𝗴𝗲𝗿𝘀 on the back to charge your mobile devices overnight for the next day. Hold press "HOUR" button to change the 12-hour or 24-hour Time Format for your convenience. Hold press "SET TIME" button to turn on the DST - Daylight Saving Time function.
• 🔊 365-DAY PRODUCT WARRANTY: PPLEE Vibrating Loud Alarm Clock with Bed Shaker provides One-Year Warranty, One-Month Money Back and 24-Hour Response, if you have any questions about our products, pls contact us via Amazon, we will response in 24H.
• ⏰ 12/24 HOUR TIME FORMAT & DST FUNCTIONS: Simply slide “12H/24H” switch button to choose the time format for your convenience. Hold press the “SET TIME” button to control the Daylight Saving Time.
• ⏰ CONSIDERATE AFTER-SALE SERVICE: PPLEE 𝗲𝗮𝘀𝘆 𝘁𝗼 𝘀𝗲𝘁 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 is a best gift for your friends or families, suitable for Christmas, New Year or Birthday and so on. With excellent after-sale service - 365 days product warranty, 30 days free return, 24 hours response. Any questions, pls contact us via Amazon or our support email.

More on Sonic Alert SB1000SS Sonic Boom Alarm Clock

• Nullify
• 113 dB extra-loud alarm clock (with adjustable tone & volume control)
• Built-in receiver for other Sonic Alert signalers
• SS12VW Super Shaker bed vibrating unit
• 120V Lamp connection input
• User select-able alarm and snooze duration
• SB1000-V3 is the latest version of SB1000SS, has nothing to do with functionality.

More on Sonic Alert 0 Sonic Bomb Extra Dual Alarm Clock with Large Display-SBD375SS,...

• Nullify
• Made in the USA or Imported
• EXTRA-LOUD dual alarm with volume control
• SUPER SHAKER BED SHAKER wake with a shake
• LARGE DISPLAY FACE see from across the room
• DIMMER FUNCTION 5-levels of brightness or not at all
• SNOOZE TIME 1-30 minutes your choice

More on Sonic Alert Digital Alarm Clock - Travel Alarm Clock for Heavy Sleepers - Bed...

• 𝐏𝐨𝐫𝐭𝐚𝐛𝐥𝐞 𝐕𝐢𝐛𝐫𝐚𝐭𝐢𝐧𝐠 𝐀𝐥𝐚𝐫𝐦 𝐂𝐥𝐨𝐜𝐤: Wake up on time anywhere with our White Portable Alarm Clock! This sleek travel alarm clock comes with powerful vibrations and is designed for those who are always on the go and cannot rely on the alarm in their watches or handheld devices for waking up in the morning.
• - 𝐀𝐥𝐚𝐫𝐦 𝐂𝐥𝐨𝐜𝐤 𝐟𝐨𝐫 𝐃𝐞𝐚𝐟: Sonic Alert’s portable clock has a built-in high strength bed shaker to jolt you out of your sleep within seconds! The bed shaker is a bed vibrating unit that vibrates when the alarm goes off to ensure that everyone including those who are deaf or hard of hearing, always wake up on time.
• - 𝐄𝐱𝐭𝐫𝐚 𝐋𝐨𝐮𝐝 𝐀𝐥𝐚𝐫𝐦 𝐂𝐥𝐨𝐜𝐤: Whether you keep this digital portable alarm clock in your pocket, bag, or next to your bedside, this compact & light alarm clock is perfect for medication reminders, cooking reminders, & waking up on time for important meetings, flights & events. Keep Sonic Alert’s compact day & night portable alarm clock with you 24/7 on the go for all of your alarm needs!
• - 𝐏𝐨𝐩-𝐮𝐩 𝐃𝐢𝐬𝐩𝐥𝐚𝐲 & 𝐎𝐭𝐡𝐞𝐫 𝐄𝐚𝐬𝐲 𝐭𝐨 𝐔𝐬𝐞 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬: Compact, lightweight, and self contained, this small alarm clock is easy to use and operate. Some unique features of this product include: a 0.75" pop-up display with aconvenience light, easy-to-set functions, a test feature to assess batteries, a 1-year warranty, and a continuous 4- minute snooze function.
• - 𝐀𝐰𝐚𝐫𝐝-𝐖𝐢𝐧𝐧𝐢𝐧𝐠 𝐁𝐫𝐚𝐧𝐝: Sonic Alert is an award-winning globally recognized leader in the international electronics field that helps the deaf, hard-to-wake, and elderly communities across the world with their notification needs. As a trusted brand for over 40 years, we strive to provide innovative extra loud alarm clocks & other products that support our mission to alert & notify users through electronic communications.

More on Loud Alarm Clock with Bed Shaker, Vibrating Alarm Clock for Heavy Sleepers...

• ⏰【Wake by 𝗦𝘁𝗿𝗼𝗻𝗴 𝗕𝗲𝗱 𝗦𝗵𝗮𝗸𝗲𝗿 & 𝗟𝗼𝘂𝗱 𝗕𝘂𝘇𝘇𝗲𝗿】- Differ from regular alarm sound clock, our 𝗹𝗼𝘂𝗱 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 comes with 3 innovative alarm methods: loud buzzer, super bed shaker or both sound and shaker, actually make it easier to wake you up from deep sleep. Simply press the “BUZZ/VIB” button to choose your favorite wake-up modes for maximum impact. The bed shaker alarm clock is also a perfect option for heavy sleepers, hearing impaired, deaf or hearing loss.
• 🔊【Strong Wired Vibration Shaker & Adjustable Volume】- The 𝘃𝗶𝗯𝗿𝗮𝘁𝗶𝗻𝗴 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 features with 71” wired bed shaker which is long enough to be placed under the mattress. It can produce a strong vibration to shake you awake without disturbing others. The alarm sound volume is 4-level adjustable to meet your different needs. Combing the highest volume level and powerful bed shaker, you can be reliably waken up on time even for heavy sleeper.
• 😴【Dual Alarm Clock & Big Snooze Function】-The 𝗱𝘂𝗮𝗹 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 allows you to set two separated alarms easily especially handy for couples or roommates who keep different schedules. When the alarm goes off, lightly touch the big snooze button to turn off temporarily and get extra 9 minutes sleep before alerting you again. You can also press the “ALARM PAUSE” or “ALARM OFF” to turn off the alarm for 24hours or permanently respectively.
• 🔅【7.5’’ Large Display & 5 levels Brightness Dimmer】-With 7.5’’ big LED display, the numbers on the 𝗯𝗲𝗱 𝘀𝗵𝗮𝗸𝗲𝗿 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 are ultra-clear to see from a long distance or across the bedroom even without glasses. 5 level adjustable screen brightness help you avoid high-intensity light while you are asleep or easily view the time in the daytime.
• 🔋【Electric Powered with Battery Backup】- All functions of the 𝗯𝗲𝗱𝗿𝗼𝗼𝗺 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 work under AC power (input power 100-240V), 2pcs AAA backup batteries (NOT Included) are only used to memorize time and alarm settings when encountering power outage. During the backup battery, the screen will go blank but the alarm will still be triggered.
• 📱【USB Charger Port Design & 12/24H Format】- The 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 𝘄𝗶𝘁𝗵 𝗨𝗦𝗕 𝗰𝗵𝗮𝗿𝗴𝗲𝗿 port (5V/1A) provides the convenience for charging your phone or other device safely while you sleep. The 12/24H format and DST function are also available by pressing the corresponding buttons.
• 🎁【Easy to Operate & Wide Application】- With the intuitive setting buttons, the 𝗮𝗹𝗮𝗿𝗺 𝗰𝗹𝗼𝗰𝗸 𝗳𝗼𝗿 𝗵𝗲𝗮𝘃𝘆 𝘀𝗹𝗲𝗲𝗽𝗲𝗿 is easy to use even for kids or elders. Updated features such as vibration, dual alarm, dimmer, USB charging port and modern design, the digital alarm clock can be as a perfect choice for your family, friends, kids.

More on Haokaini Sonic Boom Alarm Clock, Extra Loud Vibrating Dual Alarm Clock,...

Features 3 alarm modes available, including ring, vibrate, ring and vibrate. Dual USB charging ports, can be used to power different devices at the same time. 4.75" vibrator cable is long enough to put under your pillow, wakes you up easily. Unique snooze function, allows you to set snooze time from 1 minute to 30 minutes. 3.74" digital display, continuously adjustable brightness and volume control. Specification: -Color:Black -Material:ABS -Alarm Clock size:14.5x15x6.5cm -Vibrator size:10.5x3.9x10.5cm -Screen size:3.74" -Battery:3x AAA Battery(Not included) -Power cord length:1m/3.3" -Vibrator cable length:1.45m/4.75" Package List: 1x Alarm Clock 1x Vibrator

More on Sonic Alert - Sonic Bomb Dual Alarm Clock with Bed Shaker Vibrator and...

Sonic Alert Best-Seller! The Sonic Bomb Alarm Clock with Super Shaker has an extra-loud adjustable 113 dB volume, super bright strobe lights, and the industry leading powerful 12V bed-shaker to ensure you wake on-time, every time. Customize your clock's features with five-level dimmer, adjustable tone and volume, dual time 12/24-hour format, and flexible alarm and snooze duration. Test mode to ensure all your settings are working and the battery back-up keeps your settings secure during a power-outage. Colour: Black & Red with digital display technology.

More on Sharp Big Bang Super Loud Alarm Clock for Heavy Sleepers, 6 Extremely Loud...

• 𝗘𝘅𝘁𝗿𝗮 𝗟𝗼𝘂𝗱 𝗔𝗹𝗮𝗿𝗺 𝗖𝗹𝗼𝗰𝗸: The Sharp BIG BANG is the loudest alarm clock for kids of all ages. The up to 115db extremely loud alarm clock allows you to adjust the volume AND tone of the alarm sounds to create the perfect custom noise to wake you up!
• 6 EXTREMELY Loud Wake up Sounds – Adjust the volume and tone of the six different unique sounds that will get you out of the bed and ready to start your day! Choose from Rooster, Bugle, Nagging Mom, Jackhammer, Siren, Loud Beep – Up to 115db Alarm Volume
• D𝘂𝗮𝗹 Extra Loud A𝗹𝗮𝗿𝗺s with Custom Snooze Functionality: Allows you to set two separated alarms easily especially handy for couples or roommates who keep different schedules. When the alarm goes off, touch the snooze button on top of the clock to give you a few more minutes of sleep. Snooze can be customized to a time of your choosing from 1-59 minutes. If you don’t adjust the custom snooze, the default snooze time is 9 minutes.
• 3 Step Dimmer Control: 3-LEVEL ADJUSTABLE BRIGHTNESS -- The digital clock provides 3 levels of brightness (Off, Low, High) allowing you to select the most comfortable brightness.
• ELECTRIC POWERED with “NO WORRY” BATTERY BACKUP: Plug into standard household wall outlet (This alarm clock is compatible with 110V/120V power outlets) to power the Sharp Big Bang Extremely Loud Alarm Clock. Battery Backup (Requires 2 x AAA batteries (not included)) This clock is electric operated; The battery backup is used for storing the time and alarm settings if the power is interrupted. During battery backup the clock’s display will not be lit. Once the power is restored the display will re-light.

More on Sonic Alert Grey/Red Sonic Bomb Junior Alarm Clock with Bed Shaker -...

Sonic Bomb Wake with a Shake with our Sonic Bomb alarm clock. It is designed for the heavy sleepers, who have a tendency of sleeping through the alarm. The best part of the alarm is the strong bed shaker that the alarm clock is equipped with. It has a full range dimmer to control the brightness of the clock, so you wake up fully rested and restored. USB Charging Port Power-up your smartphone with the USB charging port while you sleep, or when you do not have access to a power outlet when traveling. Along with this it has a snooze with nine-minute duration and a 5-level dimmer option, so that the light would not affect your sleep. Trustworthy Brand Sonic Alert is an award-winning globally recognized leader in the international electronics field, which helps the deaf, hard-to-wake, and elderly communities across the world with their notification needs. As a trusted brand for over 40 years, we strive to provide innovative extra loud alarm clocks & other products that support our mission to alert & notify users through electronic communications. Strong Vibrator Sonic Bomb comes with a powerful 12-volt bed shaker to jolt you out of your sleep within seconds! Our super shaker is a bed vibrating unit that vibrates when the alarm clock goes off to ensure that you always wake up on time. It also has three different modes: vibration, buzz, or vibrate/buzz combo. Allowing you to choose the mode that best meets your needs. Extra Loud Alarm Clock Sonic Bomb Alarm Clock is the perfect alarm clock for all ages! Its 102dB alarm is super effective for waking even the heaviest sleepers.

More on Sonic Alert - Sonic Bomb Dual Alarm Clock with Bed Shaker Vibrator and...

Sonic Alert Best-Seller! The Sonic Bomb Alarm Clock with Super Shaker has an extra-loud adjustable 113 dB volume, super bright strobe lights, and the industry leading powerful 12V bed-shaker to ensure you wake on-time, every time. Customize your clock's features with five-level dimmer, adjustable tone and volume, dual time 12/24-hour format, and flexible alarm and snooze duration. Test mode to ensure all your settings are working and the battery back-up keeps your settings secure during a power-outage. Colour: Classic Blue with digital display technology.

More on Sonic Alert SB200SS Boom Travel Alarm Clock with Super Shaker

The Sonic Alert Sonic Boom travelAlarm Clock with Super Shaker isa great bedside alarm clock as well as an easy-to-use travelclock. it gas a unique, extra-loud dual alarm for both sleep and wake confidence. It features a large dislay with 5-level dimmer and a powerful bed shaker that allows others to sleep while you wake up to the vibrations. Sleep well with the confidence of knowing you'll wake up on time.

More on Sonic Alert – Sonic Boom Analog Alarm Clock with Black Bed Shaker – Grey

Since 1980 the Sonic Alert alarm clock has been the strongest loud alarm clock for heavy sleepers and deaf individuals in the market! For those who prefer a bit more traditional clock and an easy-set dial. There's no confusion when dialing in the clock time or your wake-up time. This Sonic Bomb super loud alarm clock of 113db is equipped with a 12-volt bed shaker. It also features a nightlight that can illuminate your surroundings with two different brightness levels, or be switched off. It is esthetical pleasing and streamlined, and it has all the power needed to wake you up in the morning! Sleep well knowing you'll wake up on time.

More on Sonic Alert The Sonic Boom - Alarm clock - electronic - desktop

Sonic Boom Our White Sonic Boom Clock with digital display technology receives all the incoming notifications from your Sonic System transmitters, while also acting as your reliable, extra-loud, alarm clock. The best part of the alarm is the strong bed shaker that the alarm clock is equipped with. It has a full range dimmer to control the brightness of the clock all wake up fully rested and restored. Adjustable Alarms You can set multiple alarms with Sonic Boom with a duration from 1-59 mins and a snooze feature from 1-30 minutes. It also has an integrated lamp ‘flash’ that lets you know when you receive a notification. Trustworthy Brand Sonic Alert is an award-winning globally recognized leader in the international electronics field, which helps the deaf, hard-to-wake, and elderly communities across the world with their notification needs. As a trusted brand for over 40 years, we strive to provide innovative extra loud alarm clocks & other products that support our mission to alert & notify users through electronic communications. Strong Vibrator Sonic Boom comes with a powerful 12-volt bed shaker to jolt you out of your sleep within seconds! Our super shaker is a bed vibrating unit that vibrates when the alarm clock goes off to ensure that you always wake up on time. It also has three different modes: vibration, buzz, or vibrate/buzz combo. Allowing you to choose the mode that best meets your needs. Extra Loud Alarm Clock Sonic Boom Alarm Clock is the perfect alarm clock for all ages! Its 113dB alarm is super effective for waking even the heaviest sleepers.

More on Sonic Bomb Dual Alarm Clock ,Loud Alarm Clock for Heavy Sleepers with Bed...

Features 3 alarm modes available, including ring, vibrate, ring and vibrate. Dual USB charging ports, can be used to power different devices at the same time. 4.75" vibrator cable is long enough to put under your pillow, wakes you up easily. Unique snooze function, allows you to set snooze time from 1 minute to 30 minutes. 3.74" digital display, continuously adjustable brightness and volume control. Specification: -Color:Black -Material:ABS -Alarm Clock size:14.5x15x6.5cm -Vibrator size:10.5x3.9x10.5cm -Screen size:3.74" -Battery:3x AAA Battery(Not included) -Power cord length:1m/3.3" -Vibrator cable length:1.45m/4.75" Package List: 1x Alarm Clock 1x Vibrator

More on Sonic Alert SB1000 Sonic Boom Combination Alarm Clock

The Sonic Alert Sonic Boom Combination Alarm Clock is a fully capable combination clock with many key features and the added capability to connect with signalers as well as a nearby lamp. The Sonic Boom extends the convenience level to eliminate the need for separate receivers in your bedroom to alert you to such things as your baby crying, the doorbell or the telephone when using with a Sonic Alert signaler. There is also a test button on the unit to explore which combination of flashing lights, shaking bed or loud pulsating audio alarm will work best for you. Sleep well knowing you're connected.

More on AMIR Dual Extra Loud Alarm Clock with Bed Shaker, Sonic Boom Alarm Clock with...

• Multifunctional & Simple Operation: This vibrating flashing LED alarm clock has a dual alarm function, convenient to set reminders for different schedules. It also provides 12/24 hours system switching. The alarm clock is operated by independent buttons, all short press, no complicated operation, convenient for the elderly or children to set independently.
• 3 Wake-Up Modes: Our alarm clock provides 3 wake-up (ringing only, ringing + vibration, and vibration only). Perfect for kids oversleeping for school, heavy sleepers, or the hearing impaired. No matter how deeply you sleep, the alarm clock features red flashing alert lights will rouse you.
• Bed Shaker: Morning wake-ups can be quiet and effective with the AMIR alarm clock's powerful vibrator, ensuring you rise without disturbing others nearby. Simply place it under your mattress for an immediate wake-up experience, ensuring you rise without fuss. Perfect for people who have trouble getting out of bed, people with hearing impairments, and early risers.
• Customized Settings: This electronic alarm clock allows you to rotate the knob to adjust the brightness and volume to your preference. The infinitely fine adjustments enable optimal visibility of the display, helping you create a cozy nighttime sleeping environment. Additionally, you can customize the alarm duration and snooze time (1-30 minutes each) according to your needs.
• 2 Power Options: Only for daily use, please connect the power supply via USB to make sure the alarm clock screen is always on. When you need to go out or there is no power port nearby, please use the battery for power supply, the screen will turn off automatically when the battery power is not operating. In addition, this vibrating alarm clock has 2 USB ports for charging your cell phone or other electronic devices at the same time.