Specification: Type: folding keyboard Quantity: 1pc Material: ABS Color: black/white Key number: 67pcs Voltage: 3-4.2v Connection method: Bluetooth connection Interface Type: USB 3.0 Battery capacity: 80 Power supply: Built-in 302323MAH lithium battery Extended storage: not supported Bluetooth protocol: 3.0 Effective distance: 15 meters Mode of operation: button Display: None Whether to support APP: No Supported formats: Bluetooth Is there a radio function: None Button life times: 3 million clicks System support: support for Apple, Android, Windows system Working time: 20 hours Standby time: 300 days Closed size: 150*58*10mm/5.9*2.28*0.39’’(L*W*H) Expanded size: 286*89*5mm/11.24*3.5*0.2’’(L*W*H) Net weight:140g/4.94oz