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Sharp

Sharp Big Bang 115dB Alarm Clock for Heavy Sleepers, Dual Alarms

  • Based on 2,278 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Oct 26
Order within 16 hours and 53 minutes
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Color: Red


Features

  • DESIGNED FOR HEAVY SLEEPERS & DEEP SLEEP - Built specifically for people who sleep through phone alarms and standard clocks. The Sharp Big Bang delivers powerful wake performance for adults, teens, students, and shift workers who need dependable morning wake-ups.
  • 115dB EXTREME WAKE-UP PERFORMANCE - Extra-loud alarm reaches up to 115dBlouder than most household alarmshelping ensure you wake up on time for work, school, travel, or early schedules when waking up truly matters.
  • 6 HIGH-IMPACT WAKE SOUNDS THAT BREAK THROUGH SLEEP - Choose from Rooster, Bugle, Siren, Jackhammer, Beep, or Nagging Voice alarms designed to interrupt deep sleep cycles and prevent missed alarms or oversleeping.
  • DUAL ALARMS + BACKUP SECURITY - Set two independent alarms for weekday/weekend schedules or backup wake times. Battery backup preserves alarm settings during power outages for reliable everyday use. Requires 2 x AAA batteries (not included)
  • LARGE EASY-READ DISPLAY WITH DIMMER CONTROL - Oversized white LED display is clearly visible across the room with adjustable brightness levels, providing comfortable nighttime viewing without disturbing sleep.

Description

Built specifically for people who sleep through phone alarms and standard clocks. The Sharp Big Bang delivers powerful wake performance for adults, teens, students, and shift workers who need dependable morning wake-ups. Extra-loud alarm reaches up to 115dB — wake up on time for work, school, travel, or early schedules Louder than Phone Alarms Built for heavy sleepers—Sharp Big Bang delivers powerful, dependable wake-ups every morning. 6 powerful alarms—Rooster, Bugle, Siren, Jackhammer, Beep & Nagging Voice to wake heavy sleepers. Sharp Super Loud Clock Sharp Vibrate/Loud Clock Sharp SPC100A Alarm Clock Sharp Clock w/USB Charge Sharp Battery Alarm Clock Is this alarm clock loud enough for heavy sleepers? Yes. The Sharp Big Bang reaches up to 115dB and is designed specifically for deep sleepers and people who sleep through phone alarms or standard bedside clocks. Will this wake someone who sleeps through phone alarms? The Big Bang alarm is significantly louder than most smartphone alarms and uses powerful wake sounds designed to break through deep sleep cycles. Is this alarm clock good for shift workers or changing schedules? Yes. Dual alarms allow separate wake times for rotating shifts, early mornings, or backup alarms, making it ideal for shift workers and busy schedules. What happens if the power goes out overnight? Battery backup keeps your alarm settings saved during power interruptions so your wake-up schedule remains protected. Who is this alarm clock best for? The Sharp Big Bang is ideal for heavy sleepers, teens, students, adults, and anyone needing a dependable alarm clock for work, school, or daily wake-up routines.

Brand: Sharp


Color: Red


Display Type: Digital


Style: Classic


Special Feature: Alarm, Battery Backup, Loud Alarm


Product Dimensions: 3.55"W x 5.91"H


Power Source: Battery Powered


Room Type: Bedroom, Living Room, Dining Room, Kitchen, Kids, Nursery, Bathroom, Home Office


Shape: Rectangular


Indoor/Outdoor Usage: Indoor


Display Type: Digital


Additional Features: Alarm, Battery Backup, Loud Alarm


Power Source: Battery Powered


Indoor Outdoor Usage: Indoor


Mounting Type: Wall Mount


Number of Batteries: Unknown batteries required.


Alarm Clock: Yes


Operation Mode: Electrical


Input Voltage: 120 volts


Watch Movement: Automatic


Item Dimensions W x H: 3.55"W x 5.91"H


Item Weight: 12.48 ounces


Size: Large


Frame Material: Plastic


Color: Red


Style Name: Classic


Room Type: Bedroom, Living Room, Dining Room, Kitchen, Kids, Nursery, Bathroom, Home Office


Shape: Rectangular


Theme: Music


Dial Color: Red


Clock Form: Time Clock


Brand Name: Sharp


Number of Items: 1


Number of Packs: 1


Unit Count: 1 Count


Item Highlight: 6 wake sounds; Large red LED display; Adjustable dimmer; Battery backup; Extra-loud 115dB alarm; Dual alarm settings


Manufacturer: Sharp


UPC: 049353008615


Manufacturer Part Number: SPC657AJAMZ


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Finally, an Alarm That Actually Wakes Me Up!
Color: Silver
This alarm clock is AMAZING! If you’re a heavy sleeper, this is definitely worth trying. The alarm is incredibly loud and actually gets my attention in the morning. I also love that there are several different sounds to choose from, so I can change it up depending on my preference. The adjustable tone and volume are great features, and the clock is easy to set up and use. I’ve tried plenty of alarms before, but this one really stands out. It gives me peace of mind knowing I’m much less likely to sleep through an important morning. Highly recommend this for anyone who struggles to wake up, especially heavy sleepers. It definitely does what it’s supposed to do! ... show more
Reviewed in the United States on September 23, 2026 by Hunter80
    • Nice alarm clock
Color: Silver
A nice alarm clock, easy to set , alarm is very loud and adjustable as well as the brightness. Battery backup is nice but I think the alarm doesn’t work if the power is off. Seems to be very accurate time wise.
Reviewed in the United States on October 9, 2026 by John F
    • Its EXACTLY what is described... I sleep like a rock - this is the only thing that will wake me up!!
Color: Red
This Sharp Big Band Super Loud Alarm Clock - is the real deal. It isn't a normal loud, it is EXTREMELY LOUD! Which is exactly what I wanted and needed! It has different wake up sounds and has I think 1-15 different loud settings, 15 being the loudest. If your anything like myself (I would call myself a very, very, HARD sleeper, anything above "10" will work for me) but I still have it all the way up just so I know ill wake up regardless! It's a blessing and a curse to be able to sleep like I do, but the curse is that normal alarm clocks just don't do it! I even looked into those alarm clocks with a shaker for your pillow.. I can tell you with how loud this is, you don't need anything else but this alarm clock! To give you a little example of how deep of a sleeper I am, when my fiancé and myself were in the hospital after our third child, the fire alarm for the brand new hospital we were in, went off and everyone on our floor ran out of their room thinking if was for real, and this was around 3AM in the winter, there was snow on the ground outside - I was still sleeping on the bed completely unfazed from this gigantic alarm going off through the hospital. Yes I was a bit sleep deprived as well but still, even if I wasn't, I would not have woken up.. So after saying that type of story, and for me to say this works for me should tell you how loud this alarm clock is!! I will say if your sharing a house with roommates, small kids, or a family - you may want to let them hear it so they at least don't awaken frightfully when it goes off lol regardless where this alarm is located in your house, it WILL wake up people throughout the house if you have to have it on the loudest setting. My fiancé can literally wake up to her phone vibrating in the morning. She is a very light sleeper so if she was around in the morning to hear this alarm clock go off it would probably blow her eardrums out (lol being a little dramatic but it is extremely loud when your right next to it) but really this is so loud it will wake some up everyone in the house. In all seriousness this alarm clock does its job for HEAVY SLEEPERS and is a fantastic!! I have loved it since the first morning Ive used it. It has not let me down yet and I HIGHLY recommend this alarm clock to the people that sleep similarly to myself. 5 out of 5 stars for this product! Love it!! ... show more
Reviewed in the United States on November 24, 2024 by Sean G.
    • THIS IS A GREAT CLOCK - UNTIL IT FALLS ON THE FLOOR. AVOID THIS CLOCK!
Color: Red
I really like this clock. It has controls that are intuitive, the display is very good, and most of all, the alarm is very loud! You can also select from several humorous alarm themes. In fact, I've bought three of these. But not for the reason you think. These clocks have a "wall wart" power supply. If your clock falls off your nightstand and hits the part where the cord plugs into the clock, it will destroy your clock. Now, if you're one of those people who NEVER have knocked an alarm clock off your night stand, there's nothing to worry about. BUT if you're like the other 98% of us, this WILL happen to you. The circuit board where the power plug from the wall wart plugs into the back of the clock is apparently very flimsy. Drop the clock onto the floor and the power plug will get pushed in and the circuit board will break, leaving you with a $27 paper weight. It happened to me TWICE. It WILL happen to you. If you don't mind replacing the clock every 60 days, this should not be a real problem. ... show more
Reviewed in the United States on July 5, 2026 by Bev Temmer
    • Very loud (4/2025)! Light issue (10 months later)
Color: Silver
Review Image by Carolyn B
Update 10 months after purchase. Had to order another one because the numbers are no longer lighting up properly. See picture. Time is 11:58 but hard to tell, especially when half asleep. And the picture makes it seem more clear than it is. We are trying to teach our 15 year old grandson to get up on his own. He sleeps so hard that when he wakes up it is like he is coming out of general anesthesia, I am not kidding. This is super loud and does a great job waking him up. The reason I can’t give 5 stars is because it turns off after a few minutes- that defeats the purpose. He knows that all he has to do is lay there for awhile and can fall back to sleep. Fortunately he uses the second alarm, but still - it should not turn off until he turns it off. ... show more
Reviewed in the United States on October 20, 2025 by Carolyn B
    • Super Loud Alarm Clock
Color: Silver
I already wore hearing aids in both ears and recently lost most of my hearing in my right ear. If I had to get up at a certain time I would have to call a friend and have them call me that morning because I could no longer hear my alarm. This clock is WONDERFUL!! I love being able to pick what sound I want to wake me up, the tone I need for that sound and how loud I need it to be. I also love being able to set it for 2 different alarm times. It was super easy to follow the instructions on how to learn to set everything. My biggest advice would be to take your time when you get it and have fun playing with the sounds ,volume and tones and chose what works the best for you. Now I can have it all set and ready in just seconds for the next morning. THANK you for giving me my independence back. ... show more
Reviewed in the United States on September 13, 2026 by S. Ruark
    • It’ll wake you up
Color: Silver
Great alarm clock that holds up to being louder than standard alarms. I work in construction with loud equipment/machines all day so the standard tone of some alarms like on your phone won’t always be reliable to get me up. This one holds its weight in volume has multiple sound variations you can utilize to keep it waking you up reliably. Easy to operate, large size to see from a distance and compact size to keep your nightstand space. ... show more
Reviewed in the United States on September 22, 2026 by Jeff
    • Loudest alarm clock
Color: Red
If waking up has ever been a problem in your life, this is the solution. This alarm clock is EXTREMELY loud. Very easy to use, you can adjust the brightness, I feel like its priced fairly. You are able to install batteries as a back up to keep the time. I have tried other alarms and none of them get as loud as this, it genuinely works. I now own 3, 1 for myself and my children ... show more
Reviewed in the United States on March 11, 2026 by jackie

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