Specification: Open Size: About 304.1 x 97.8 x 6.1mm Folded Size: About 152.4 x 100 x 19.8mm size: About 132 x 61mm Number of key caps: 81 keys Key working current: Less than 4mA. Standby current: Less than 0.65mA. Touchpad working current: 15mA Sleep current: 27A Net weight of keyboard: About 275g Lithium battery capacity: 140mAh Working distance: 10m way: Press key Working voltage: 3.7 V Charger specifications: 5V 1A or 2A : Ten minutes Standby Time: 90 Uninterrupted Working Time: 35H System support:Win/Android/IOS/OS/ Multi-channel connection When connecting the first device, first press Fn+1 and then press Fn+C to start the connection. Before connecting the second device, press Fn+2 once, then press Fn+C to start the connection. Before connecting the third device, press Fn+3 once, then press Fn+C to start the connection. To use multiple devices at the same time, press Fn +1/ 2/ 3 to switch to the connected devices freely . Keyboard Maintenance 1.Please keep the keyboard from liquid or humid environment,saunas,swimming pool, room and 't let the keyboard get wet in the rain. 2.Please 't expose the keyboard at too high or too low temperature condition. 3.Please 't put keyboard under sun for a long time. 4.Please 't put keyboard close to the flame, such as cooking stoves,candlesor fireplace. 5.Avoid sharp objects scratching products , timely to recharge products to ensurethe normal use. color: Black Material: ABS Package Contents: 1 x Foldable Bluetooth Keyboard 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.