Features 1PLUG IN AND USE: LED music alarm clock with low power design of 5V 1A Power Supply, USB interface, for plug in use and does not support batteries and charging. 2FIVE LEVELS BRIGHTNESS ADJUSTMENT: Digital clock supports multi level brightness adjustment, you can adjust the appropriate brightness according to your habits, comfortable to accompany each night. 340 CLASSIC MUSIC: Music LED digital alarm clock with massive music ringtones, not only for music appreciation, but also wake up comfortably every morning. 42 SETS ALARM SETTING: Two sets of alarms can be set in one day meet different time needs,reasonable planning time. 5MEMORY FUNCTION: Built in CR2025 3V button battery, switch power supply mode and no need to reset after power off but the screen does not show. Specification Item Type: LED Music Alarm Clock Material: ABS Screen Display: Time, Date, Temperature Temperature Display: Fahrenheit and Celsius Can Be Switched Time System: 24 Hours, 12 Hours Alarm: 40 Songs Battery: 50mah CR2025 Button Cell (Included) Gross Weight: 320g/11.3oz Package List 1 x Digital Clock 1 x Instruction Manual Note Built in button battery function is only a time memory function after a power failure, can not store power to show the time.