Specifications: Product Type: Reel Foldable Keyboard Item Type: Bluetooth Wireless Keyboard Bluetooth Type: 3.0 Power Supply: 1 * AAA dry Battery (not include) Working Voltage: 1.5V Working current: 2.5mA Working time: 288 Hours Multi-Device Connection: 1-3 Devices one time in same usage Main Material: Plastic Keyboard has holder for Tablet PC iPad iPod iPhone System Support: IOS, Android, Windows systems Dimensions: 252x46.8x28.8mm Net Weight: 196g