Features: Unplugged the USB cable, the alarm clock will enter energy-saving sound-activated mode, when the ambient sound is up to 90 decibels, the clock will display and will go out automatically after 8 seconds. If under USB-powered condition, the sound-activated function close and the screen will always on.  The dual alarms make it possible to set two separate wake-up times, the alarm lasts 2 minutes. Touch the snooze function, snooze for 5 minutes. Wake you at different times.  There are 13 kinds of wake-up music to choose from. Music can play continuously for 5 minutes. And the volume can adjusted according to personal preference.  The mirror LED display make this alarm clock looks stylish and modern, it functions Celsius / Fahrenheit display, 24 hours / 12 hours conversion, memory function, no need to reset after shutdown.  The brightness of the time display can be adjusted for 4 levels, can not only save the power, but also emit soft light for sleeping.  This Stylish and simple mini mirror alarm clock can decorate your bedroom, living room, office, dorms.     Specifications:  Material: ABS;  Power input: 5V 1A;  Working current: 110ma;  Color: White, Silver;  Dimension: 145*65*32mm;  Power supply: Built-in battery or direct USB-powered;     Package included: 1 x Mirror LED clock;  1 x USB cable;  1 x User manual