NETUM C750 barcode scanner provides a total of 2 wireless connection modes, including "2.4G radio frequency mode" and "Bluetooth mode". If you choose to connect your barcode scanner in "2.4G RF Mode": 1）Please plug in the 2.4G USB to your computer first. 2）Use the barcode scanner to scan the following "2.4G RF Mode" barcode to enter the pairing mode, and the barcode scanner will automatically complete the pairing. If you choose to connect your barcode scanner in "Bluetooth Mode": 1）Use the barcode scanner to scan the "Bluetooth Mode" barcode, the barcode scanner will enter pairing mode, and the blue LED will flash. 2）Turn on your mobile device and go to the Bluetooth setting, turn on the Bluetooth and click "C barcode scanner" to pair. After successfully pairing, there will be a voice prompt, and the blue LED light will keep on.