Amazon.com: SHARP Big Bang Super Loud Alarm Clock for Heavy Sleepers, 6 Extremely Loud Wake Up Sounds: Rooster, Bugle, Nagging Mom, Jackhammer, Siren, Beep – Up to 115db Volume, Red/Black with Red
Blitz Alarm Clock #1 Loudest on the App Store
The 5 Best Alarm Clocks for Heavy Sleepers – Review Geek