If you have trouble waking up, this clock with loud alarm and bed shaker puck should help a lot! Also great for seniors or anyone with impaired hearing. There are 3 wake modes; choose, bed shaker/buzzer/both. You can place the bed shaker under your pillow without disturbing other with a loud audible alarm. If you want an alarm, the volume can be adjustable by volume slider, 3 levels from low (75dB) to high (90dB). If you want there’s also a nightlight with a choice of 7 colors. The nightlight bar acts as the snooze button when your alarm sounds. It’s preset for 9 minutes more sleep. The time display brightness has a slider which you can adjusted from 0%-100%. So if you want the clock face to be totally dark, you can. The entire display is 7”, while the time numerals are 2” high, but on the fully black background they really stand out. Back wait, there’s more! They are dual DC 5V/1A USB charging ports on the back of the clock. A battery backup (uses 2 AAA’s, not included) keeps the time in memory during a power failure even though the display will be black. And – this is clever, it will still sound the wake-up alarm for the set time, even if the power is still off! (But it uses the low volume setting & won’t use the bed vibrator, even if it’s set.) But hopefully it will stay wake you even without AC power. It was about $25.00 as on 7/9/22.