MusicMan TWS Bluetooth BT-X39 Manual De Utilización página 16

How to switch on or off the headphone
SWITCH ON: when BT-X39 is in off state, press and hold the
answer/end key for 3 seconds until the BLUE LED starts to flash for
3 times with prompt of "power on".
Removing the headphones from the charging box turns on them and
they connect automatically.
SWITCH OFF: when BT-X39 is in on state, press and hold the
answer/end key for 3 seconds until the RED LED flashes for 3 times
with prompt of "power off".
How to connect
TWS Paring
Only necessary for the first pairing. When the BT-X39 are in off state,
press and hold the answer/end key of both headphones for 7
seconds until the BLUE and RED LED flash alternatively. Now they
will pair and connect automatically. The announcement "connected,
left channel, right channel, get into paring mode" can be heard.
After TWS connecting successfully, the BLUE and RED LED of left
(main) headphone flash alternatively with prompt of pairing, which
means the pair of headphones are now in paring mode.
Once the Bluetooth connection between headphone and mobile
phone is disconnected by hand, the headphone will get into pairing
mode automatically.
Bluetooth connection (first time)
Pairing is the process of establishing link between BT-X39 and
Bluetooth devices. If no pairing is made over 5 minutes, the
headphone will cancel pairing mode.