CPIADJUSTMENT: ( Count Per Inch ). Speed of the Mouse Cursor.Adjustment ( 3 Levels ), 1, 2, 3 Level. The higher the level, the faster the speed. The default speed isset at level 2 1. Speed Increase: Press OK button + Volume + ] button for about 3seconds, the work indicator flashes quickly and thengoes off, release the button, on the basis of the increase 1 level 2. Speed Decrease: Press [ OK ] + olume - for about 3 seconds, thework indicator flashes quickly and then goes off, release the button, and is reduced by 1 level onthe basis of the 2.4G MODE: For initial use, plug a USB receiver into the USB port of device and 20-60 seconds to install driver of USB receiver. Move the mousethe mouse cursor can the screen means that pairingis successful if it is unsuccessful, press and hold [ OK and [ BACK ] buttons, LED light begin to flash. Pairing is successful when LED light stop flashing BT 5.0 MODE: 1. Before using this device, first you must turn on the BT function of thelain device 2. Then long press " OK + Return keys, when the LED turns to flashhe product enters the pre pairing 3. Click add search devices on the main device to find this airemotes name ( Example: BT-REMOTE ). Click the name can to connecting 4. After the product is successfully connected, the direction of themouse pointer can be controlled by waving in the air 5. If the connection is not successful, please perform the operationsteps of item 2-4 again 6. Reconn ent efficiency description: The normal reconnent time of thiproduct is 3-5 seconds after it is normally paired with themain equipment 7. This product can only remember the pairing information of one maindevice, when the product is connected to a device, theconnection of historical devices is not supported after 8. in this case. you need to delete the historical connection informationof s peripheral can be successfully matched for search With backlight Material: plastic colour: Black Package Contents: 1 x 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.