Swing time: Push it in by hand and it will use battery power to keep swinging until the battery runs out. There is no ON / OFF switch. OFF only after removing the batteries or running out. Iron and plastic: The top of this kinetic backdrop is made of high quality iron and the base is plastic, smooth and safe. Multi-use : This swing can be a classic desk accessory, a good icebreaker on your desk. Use it to kill time when you are bored, also can be a perfect gift and educational tool. 4pcsAA Batteries (excluded): This swing only requires 4 AA batteries and you will have desk. Easy to assemble: This perpetual swing is very simple to assemble, even children can assemble it. Specification: Material: iron and plastic Weight: approx. 300g / 10.6oz Battery: 4 * AA batteries (not included) Color: as pictures shown Process: electroplating Size: 11 * 20cm / 4.3 * 7.9inch Model: # B101, # B102, # B103, # B105 (optional) Package list: 1 x perpetual motion pattern decor