Support System: iOS, Android, Windows Number of Keys: 22 keys Wireless/Bluetooth Solution: Bluetooth+2.4G dual mode Bluetooth Version: Bluetooth 4.2 Keyboard Life (number of keys): 5 Response Speed: 30ms Wireless/Bluetooth Transmission Distance: 10 Working Current/Voltage: 1mA/3.7V (typing), 7mA/3.7V (touching) Built-in lithium Battery: yes Battery Type & Capacity: polymer soft pack lithium battery 303450, 500MAH Charging Time: 3 hours Charging Port Type: TYPE-C Use Time: more than 6 hours Standby Time: 6 months Colour:black Material:plastic Package Contents: 1 x Numeric Keypad with Touchpad 1 x Type C Charging 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.