Product Name:Dual Channel Wireless Keyboard Support system: IOS, ANDROID, WIN Number of keys: 78 Support wireless/Bluetooth: Bluetooth 3.0 Keyboard life (number of keystrokes): 5 million times Response speed: 5 milliseconds Wireless/Bluetooth transmission distance: 10 meters Working current/voltage: 0.25 mA 3.7V Built-in battery: yes Battery type & capacity: soft pack lithium battery 180 mAh Charging time: 2 hours Use time: 80 hours Product net weight: 644 grams Package weight: 885 grams Product size: 291X159X16mm Packing size: 320X170X25mm Package Contents: 1 x Bluetooth keyboard 1 x USB charging cable