System status:
Power off: MFB long press for 3 seconds
Volume up: short press VOL
Volume reduction: press VOL-
Switching languages: double-click and hold MFB in the pairing state (red and blue lights flashing)

Music control:
Play pause: press MFB
Last song: VOL- press for 2 seconds
Next song: VOL 2 seconds
Telephone control:
Answer the phone: press MFB when calling
Reject the call: the duration of the call is MFB
Unsigned redial: double-click the MFB key, then press MFB to cancel the dialing

Led display:
Power-on pairing: red and blue lights flashing alternately
Connection status: blue light flashes slowly (5 seconds 1 time)
Low voltage: red light flashing (0.5 SEC 1)

Specification:
Bluetooth Version:V4.1
with the support of Bluetooth protocol: A2DP and AVRCP, AVDTP, HFP, HSP
Valid distance:10-meter
Frequency range:2.4 GHz
Working hours:4 hours
Loading time:30 min
Departure:3.5mm audio jack
Item size:9.8 * 1.5 * 1.5 cm
Package Includes:
1 * Bluetooth Receiver
1 * 3.5 MM jack to jack Connector
1 * Charging cable