Plug In Alarm Clocks with Battery Backup: Clock itself powered by DC adapter (5V1A output, 120-220V ) which is not included for environmental protection purpose. Cell button (included) is work for memorizing the time and alarm setting but not power the clock. USB cable is included. USB Charging Port : Dual USB ports let you and your partner recharge your smartphone or other electronic device without taking up any extra wall outlets. Adjustable Brightness: 4 levels brightness setting allow you to set your comfortable display illumination. At night, you can set the dark level (4th level) to have a quiet sleep surroundings. Dual Alarms with Snooze : 2 set alarms can be set, each alarm can be turned on/off separately. Beside that, the alarms also be designed working in 5 models – work at Mon-Sun/Mon-Fri/Mon-Sat/Sat-Sun, Single Day. With this function, now you can have a good sleep during the weekend without alarm disturbed. Configurable snooze from 5-60 minutes for heavy sleepers. Modern Mirror Alarm Clocks for Bedrooms: The reflective mirror face, the sleek and ultra- thin body make the clock looks more fashion and futuristic, more than an alarm clock but also a décor of your house. Nice big digits display, time is easy to see at a glance. 12/24 hour system switchable. Weekday display remain you how time is flash and cherish everyday !.