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). 3-Level Adjustable Shaker This vibrating clock comes with three strength settings (gentle/medium/strong) for alarm vibration, while the shaker is small and compact enough to slip unobtrusively beneath a pillow or mattress. It is a Perfect solution for people who are deaf or anyone who doesn't want to wake up partners or roommates with a noisy alarm in the morning And yes, they're Perfect for extremely heavy sleepers too. Dimmer alarm clock 0-100% Dial-Adjusted Dimmer Lets you lower the brightness (or even completely off) to keep your bedroom darker while you're sleeping. You will never worry too bright at night. Operation Mode:Electrical Shape:Round Alarm Clock:Yes Style:Classic Display Type:LCD Power Source:Corded Electric Material:ABS