Instructions: 1. First press and hold for 3 seconds to power on, then insert the audio head of the receiver into the audio jack of the mobile phone or stereo, the green light flashes to indicate that it is connected in this state, 2. Long press the microphone button to switch, the red and green light flashes to indicate that it is in the hold state, 3. The green light of the receiver is always on, and the green light of the transmitter is always on, indicating that the pairing is successful. It is recommended to use it immediately after use to facilitate the next use, and it cannot be charged during use;