Mechanism for clock with black hands powered by batteries. RoHS certified. Can be used with any flat surfaces with a maximum thickness of 10 mm. The mechanism operates with AA batteries, not included. Assemble your own clock and bring the decoration you desire. The mechanism includes three hands: hour hand: 8 cm, the included hands measure: hour hand: 8 cm, minute hand: 11 cm, second hand: 12 cm. Mechanism can be mounted on a board with a maximum thickness of 10 mm. 3 hands: 8/11/12 cm. Case dimensions: 5.5 x 5.5 x 1.5 cm. Material: Plastic. Powered by a 1.5 V battery. Battery not included.