Foldable Bluetooth keyboard Specification: Opening size: approximately 304.1 x 216 x 6.1mm Folding size: approximately 152.4 x 100 x 19.8mm Touch screen size: approximately 132 x 61mm Number of keys: 81 Working current: Less than 4mA Standby current: Less than 0.65mA Touchpad working current: 15mA Sleep current: 27 μ A Net weight of keyboard: approximately 275g Lithium battery capacity: 140mAh Working distance: 10m Wake up method: button Working voltage: 3.7 V Charger specification: 5V 1A or 2A : 10 minutes Standby Time: 90 days Continuous working hours: 35 hours System support: Win/Android/iOS/OS/ Multi-channel connection When connecting the first device, first press Fn+1, and then press Fn+C to initiate the connection. Before connecting the second device, press Fn+2 times, and then press Fn+C to initiate the connection. Before connecting to the third device, press Fn+3 times, and then press Fn+C to initiate the connection. To use multiple devices simultaneously, press Fn+1/2/3 to freely switch to the connected device. Colour: Black Material: ABS+PU Leather Package Contents: 1* Keyboard 1* cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.