LED Digital Clock for Bedrooms - Multiple Nature Sounds Silent Date Time Temperature Clock with Night Mode for Heavy Sleepers Multi-Functional: Time, Clock alarm, Temperature display, Night mode, Mirror. 2 Ways power source supply: USB powered or 3 x AAA batteries powered. (If both used at the same time, USB can not charge batteries, the batteries will arouse time memory function if the USB cable is power-off.) Temperature mode (or ) for choice: Measuring range: 0-50/ 32F-122.(Built-in temperature sensor, need take a while to display the correspondingly indoor temperature.) Snooze function: Snooze interval time can be set from 5-60 minutes as your need. Time(12 or 24 hrs): LED light display, 12-hour or 24-hour format selectable. Night mode(18:00-06:00): Could open or close. After setting, the light would automatically adjust the brightness. Silent sound clock: The Clock tread on the world that run silently, never disturb your dream. Easy to set: With five function button(Mode, Alarm, Snz /Light, UP, Down), long press or short press buttons to set.