Specifications: length 5.5 * width 5.5 * height 1.5 cm Stem length: 12 mm wire about 6 mm One set includes hour needle approximately 6.5 cm long, minute hand approximately 9 cm long, second hand approximately 12 cm long and fixing screw For operation it requires an AA battery power supply, battery not included Silent movement is not silent at all. Every move is like a. In theory, it is impossible to achieve completely silent movement. You can still hear it when you put it on your ears, as there will inevitably be some friction from the operation of the gears. , which in turn produces a slight noise