Features: The phone swing device can be primary toy, which can be the rotating swing balance ball perpetual motion education toy. The phone swing device can be the children's educational physics science toy, showing the principle of conservation of momentum and energy. There are usually more uses of the phone swing device waiting to be discovered, such as increasing the number of steps, cell phone holders, etc. Battery: 4 AA batteries (not included), or USB power supplier. Note:Use 4 PCS battery AA, start it, also can run normally. Connect the USB cable to the charger and start it, then it can run normally.Please do not Connect the powerbankPlease do not Connect the computer interfacePlease do not Connect the fast chargethe USB charger and battery power, you can only choose one of them to use.USB and battery can not be used at the same for time, it is easy to damage Specifications: Material:Metal+Plastic Color:Black Size:Approx.19x10.8cm/7.48x4.25in Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Phone Wiggle Shaker 1x Cable