3 Single AlarmsThis digital alarm clock can set 3 single alarms to remind and accompany you at important moments in life. 12/24H and / formats can be switched at will, customizing your lifestyle for you Size150*90*80MM Adjustable BrightnessThe desk clock has 3 levels of adjustable brightness, which can meet your needs at different times and in different weathers, providing the most comfortable visual effect. Long press the "Up" key for 3 seconds to adjust the brightness. Voice Control ModeFun and battery-saving function. Press the "DOWN" key, "ON:sd" means voice control is on. The LED display will turn off and you can wake up the display of the digital alarm clock by clapping or tapping the clock. USB Powered/BatteryUSB powered does not require batteries, which is a green and environmentally friendly way of working. You can also use 4 AAA batteries to power the desk clock (batteries not included), giving you different options for different situations.