After the pairing connected, the master earphone (left earphone) indicator will flash “red and blue lights” alternately, and the earphone will have a voice prompt “connected, left channel, pairing”. The slave earphone indicator will enter the blue light slowly flashing, and the earphone will have voice Prompt "connected, right channel". At this time, turn on the mobile phone to search for the Bluetooth name "i7plus" and click pairing, then it works.When the pairing connection is successful, the master (left earphone) will have a voice prompt “second connected”.