Specification The keyboard contains 38 keys. Transmission and control: 2.4G RF wireless radio frequency technique. The sensor: 3 Gyro and 3 Gsensor The key number: 81 keys. Remote control distance: over 10 meters. The battery type: 2 AAA batteries. (not include) The machine power consumption: Current less than 15 mA with cursor working, less than 20 mA with microphone working, and less than 20 uA when standby. Standby power consumption: in line with the European “energy star” green environmental protection standard. Material: Rubber and silicone. Appearance of the color: Black Dimension: 172*52*19 mm Weight: about 100 g Appearance of interpretation: Manufactures have the final power of interpretation, this figure is for reference only.