Digital Desktop LCD Dual Alarm Remind Vibration Clock/ Count Down Timer F1R Alarm clock: 2 groups of alarm clocks (AL1 and AL2)With vibrate Battery: 2 x AAA Batteries (Battery Not Included. ) The longest set time: 99hours 59minute 59seconds The bell ring: 1minute (has "ling ..." or the musical sound, choose in the factory) Timer: May set the hour, minute, second as your willing Clock: Display Hour, minute, AM / PM as well as 12/24format Operating temperature: 0 degrees to 50 degrees Size: approx.3 3 / 8  3 1 / 16  3 / 4 inches (86  78  23 mm)