Specification:Material:Acrylic+ABSBattery:CR2032 (for memory time when cut off power, clock is powered by USB cable)Size:22.5*8Power supply:DC 5V 0.75WMain Function:A : LED Clock DisplayB : Display Time/Date/Temperature/Alarm by turnC : Temperature range : O ℃--50 ℃ (32"F--122"F)D : Brightness Auto 50% darker from (19 : 00-06 : 00)E : 40 peration Buttons : SET UP DOWN RESETF : Calendar From Year 2000. 01. 01---Year 2099. 2. 31 Boot Default Year 2015.01.G : LED Display Time/Date/Temperature By TurnH : AL1, AL2, AL3 3 Sets of AlarmsI : Power : 1 X CR2032 For Memory Time, DC5V DC / USB CableJ : Put On Table / On WallPackage included:1 x LED clock1 x USB cable1 x User manual