Digital alarm clock, digital clock with 3 brightness levels, electronic alarm clock powered by USB or 3 AAA batteries (NOT INCLUDED), snooze alarm clock with sound control and LED displayPower: The digital alarm clock automatically enters power when powered by 3 AAA batteries (not included). It will not disturb your sleep because the digital clock will not light up at night unless you wake it up (any sound over 60 dB nearby). Digital alarm clock with large screen: The electronic alarm clock has a large 17 cm LED display. You can change the clock format for 12 or 24 hours. There are also 3 levels of brightness for your need, making it easier to read. The ultra-thin body is ideal for a bedside table or desk. A good option to remind you to take a break. Digital clock with sound control: With the sound control function, any sound over 60dB near the clock will wake up the alarm clock LED. The screen will automatically turn off after 15 seconds in power, while you can set the alarm clock to continuous brightness when powered by USB. Snooze alarm clock: You can set the 3 alarms to wake up better. If you don't want to get up right after the first alarm, the other two alarms will wake you up after a snooze. Long press "ALARM" to set the alarm time and snooze time. Use "UP" and "DOWN" to set the hour and minute. The snooze time is from 1 min to 60 min each time.