About this itemMultifunctional Alarm Clock: This digital mirror alarm clock with large LED screen displays large fonts, time, date and temperature, which is more easily to catch the number in the distance and read from every angle. Besides, it supports ℃/℉ switch and 12/24 hour system mode switch freely3 Levels of Brightness: Press the DIMMER button to adjust the 3 levels of brightness. This LED clock bedside also can mannual convert brightness in different time period to meet your different needsUSB Powered and Battery Powered: This Bedside Clock includes a charging USB cable for your convenience for powering. When plugged with USB cable, the LED light will be on always. This Bedside smart clock for your convenience for powering, 3*AAA battery(not inclu.