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Digital clock battery operated. This digital clock is supported by 2/4 AA battery, no cable (battery not included). 2 x AA batteries can support your work and 4 x AA batteries can extend the usage time to a year or more. There is no LCD display for this watch, LED only remains on when the battery is on. Alarm clock for bedroom. The alarm can be manually switched on or off as needed. When the alarm is triggered, the \