J.Burrows JB19BF18 Instruction Manual page 8

Other Operations
Muting the boom mic：Long press the microphone button for 2 seconds.
Muting the internal mic：Long press call button for 2 seconds.
Battery status: After the headphones is powered on, press the call button
briefly once to announce the current battery power 25%/50%/75%/100%.
Clear pairing function：Press and hold the previous and next buttons for 10 seconds
simultaneously when the headphones is powered on, the pink light will be on for 2
seconds, and the headset will enter the pairing mode.