XM905 Multifunctional Voice-activated Alarm Clock LED Electronic Wall Clock 1. Turn on the backlight sound control, press and hold the button on the top of the alarm clock to set the backlight sound control on or off. 2. Three-level backlight adjustment function to meet different needs. 3. Memory function: open the battery cover, you can see two button batteries, the battery is a memory function (When the clock has no power, the clock will continue to work, but there will be no display on the screen. After power on, the clock can return to normal time, no need to readjust the time) 4. There are 25 beautiful music to choose as a music alarm clock. 5. One-key snooze: When the alarm sounds, press the top button to activate the snooze function. After 5 minutes, the alarm will ring again. In this way, the cycle can be repeated. Press any other key to cancel the snooze function. 6. 5V power interface power supply function, humanized and practical dual USB interface design, no need to wait for charging. 7. The surface is designed with ABS matte finish, and the matte matte effect is achieved from the plastic through the precision mold process, and the surface is durable and does not fade. 8. Power supply mode: rechargeable battery or external power supply 9. Size: 22x9.5x4cm