A loud alarm clock is built for people who sleep through ordinary alarms. The loudest models claim 105 to 115 decibels, and some add a vibrating bed shaker that slides under the mattress or pillow. The stated volume is the maker’s figure, so treat it as a rough guide. A very loud alarm can be startling, so look for volume settings.
The six alarms below include digital clocks, a bed shaker set and a retro twin bell. Volumes, sizes and power come from each product’s listing page. We have not used these alarms ourselves, and we make no medical claims. If hearing or sleep is a concern, ask a professional.
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What to Look For
| Feature | Why it matters |
|---|---|
| Volume levels | Multiple levels let you start lower |
| Bed shaker | Vibration helps if sound alone is not enough |
| Backup power | Battery backup keeps the alarm during outages |
| Dual alarms | Two alarms cover a second wake-up time |
Specs at a Glance
| Clock | Size and power | Volume | Notes |
|---|---|---|---|
| Sharp Shockwave | 5.5 x 3.2 in; corded | 85, 95 or 105 dB | Dual alarms; 0.9 in red LED, 4 brightness levels |
| Sharp Big Bang | 3.6 x 5.9 in; battery powered per listing | Up to 115 dB | 6 wake sounds incl. rooster, bugle, siren; dual alarms with backup |
| Cadmos | 6.5 x 3 in; corded | Up to 110 dB; 5 levels | 15 RGB colors; 7 night light colors; 2.17 in numbers |
| ANJANK | 6.9 x 5.7 in; corded | Extra loud plus vibration | Wireless bed shaker; dual alarms; no battery backup |
| AYRELY twin bell | 4.5 x 6.2 in; battery | Loud bell | Analog; silent non-ticking sweep; luminous dial |
| Bed shaker clock | 6.8 x 3.4 in; battery | Adjustable sound | Bed shaker; dual alarms; 5-level display brightness |
The 6 Best Loud Alarm Clocks
1. Sharp Shockwave 105dB Super Loud Alarm Clock
A corded clock with three volume levels of 85, 95 or 105 decibels, dual alarms, a smart snooze and a 0.9 inch red LED display with four brightness levels.
Suits: a loud alarm with volume steps. Strengths: three volume levels. Weaknesses: sound only. Skip it if you need vibration.
View Sharp Shockwave 105dB Super Loud Alarm Clock for Heavy Sleepers Dual Alarm on Amazon
2. Sharp Big Bang 115dB Alarm Clock
A 115 decibel alarm with six wake sounds including rooster, bugle and siren and two independent alarms with a backup, in a 3.6 by 5.9 inch case.
Suits: the loudest stated figure here. Strengths: six sounds and a backup alarm. Weaknesses: the volume figure is the maker’s. Skip it if you want a gentler alarm.
View Sharp Big Bang 115dB Alarm Clock for Heavy Sleepers Dual Alarms on Amazon
3. Cadmos 110dB Extra Loud Alarm Clock
A 110 decibel clock with five volume levels, a 10 minute ring, 15 RGB display colors, four brightness levels and 2.17 inch numbers, 6.5 by 3 inches.
Suits: a large readable display. Strengths: five volume levels and big numbers. Weaknesses: corded. Skip it if you want battery power.
View Cadmos 110dB Extra Loud Alarm Clock for Heavy Sleepers Adults Digital Clock on Amazon
4. ANJANK Extra Loud Alarm Clock With Wireless Bed Shaker
A corded clock with a wireless bed shaker, dual alarms and a light, vibration and sound mix. The listing warns that it has no battery backup.
Suits: sleepers who need vibration. Strengths: a wireless shaker. Weaknesses: no battery backup. Skip it if power outages are a worry.
View ANJANK Extra Loud Alarm Clock with Wireless Bed Shaker Vibrating Dual Alarm on Amazon
5. AYRELY Super Loud Twin Bell Alarm Clock
A 4.5 inch retro twin bell analog clock with a silent sweep second hand, a luminous dial and a loud bell, battery powered.
Suits: a classic bell alarm. Strengths: battery power and a retro look. Weaknesses: no stated dB in the part we read. Skip it if you need a number.
View AYRELY Super Loud Alarm Clock for Heavy Sleepers 4.5 Inch Twin Bell Retro on Amazon
6. Alarm Clock With Bed Shaker, Vibrating
A battery-powered 6.8 by 3.4 inch clock with an adjustable sound and a bed shaker, dual alarms and a five-level display brightness. The listing says it is for heavy sleepers or users who are hard of hearing.
Suits: a sound plus shaker combination. Strengths: a shaker and battery power. Weaknesses: an unknown brand. Skip it if you want a name brand.
View Alarm Clock with Bed Shaker Vibrating Alarm Clock for Heavy Sleepers on Amazon
Setup Tips
- Start at a lower volume and raise it if needed.
- Place the shaker under the mattress or pillow as directed.
- Replace batteries on a schedule.
- Test the alarm before relying on it.
Mistakes to Avoid
- Setting the volume to maximum without testing.
- Skipping a backup alarm.
- Using a corded clock with no battery backup during storms.
- Placing the clock too far from the bed.
Loud Alarm Clock FAQ
How loud is 115 dB?
Very loud. Use lower settings if you can.
Do bed shakers work?
Many people use them with sound. Results vary.
The Short Version
For volume steps, the Sharp Shockwave. For the highest stated volume, the Sharp Big Bang. For a large display, the Cadmos. For a wireless shaker, the ANJANK. For a retro bell, the AYRELY. For battery power with a shaker, the bed shaker clock.
