sweep movement with hanger steady quality battery life:10 months Spec:56×56×16.2mmAvoirdupois:25gBattery:AABattery Life:10 monthsTime Keephg:+ -1 Second/DayShaft Length:12mmTorque:≥180μN.MMeasures Of Carton:37×37×36CMQuantity:500pcs/ctnShaft length 10,12,13,16.5,18.5,20,28(mm)