Countdown Timer:This alarm clock with an external countdown timer function, can be set from 1 to 59 minutes, and it will ringing for 3 minutes when countdown is over. Suitable for cooking or as a sedentary reminder. Dual AlarmsIt has two separate alarms, you can set each alarm for daily wake up, reading time, meeting or other arrangement. Just set the time you want and it will remind you on time. Smart Screen Wake UpWhen the alarm clock is in energy saving mode, screen display can be waked up by sound, shock and tap, convenient to use. USB or Battery PoweredThis alarm clock can be powered by USB cable or 3 AAA batteries. The alarm clock will switch to power saving mode when use battery for power supply. If you want to the screen keeps on, we suggest use USB connection for power supply. ( battery not included). Mini Alarm Clock Small Size: 8.3 x 8.3 x 2.5cm (3.18 x 3.18 x 0.98 inch), portable design, perfect as a travel alarm clock. It fits easily in a suitcase, even in your pocket while traveling. Also perfect on your table, desk and shelf, bedroom for waking up.