Duet - Buttons, Indicators & Function Table – Avantree Support

Headphones Overview

Button Functions

No.	Button	Function
①	PAIR/ON/OFF	- Slide to ON/OFF to power the headphones on or off. - Hold in PAIR position for 4 seconds to enter pairing mode.
②	+ / –	Press or hold to increase or decrease volume.
③	⏯	Press and hold for 2 seconds to enable or disable the mute function.
④	EQ	Switch to enable Clear Voice or Balanced sound mode.
⑤	Mono/Stereo	Press once to switch between Mono and Stereo sound.

LED Indicators

No.	Indicator	Meaning
A	Flashing blue	Power on
	Solid blue	Connected
	Flashing red & blue	Pairing mode
	Flashing red	Low battery
	Solid red	Charging
	Off	Fully charged or power off
B	Solid orange	Balanced mode is enabled
	Solid white	Clear Voice mode is enabled
	Off	Power off

Transmitter Overview

Button Functions

No.	Button	Function
⑥	PAIR/ON/OFF	- Slide to ON/OFF to power the transmitter on or off. - Hold in PAIR position for 3 seconds to enter pairing mode.
⑦	Input Selector	Switch to match the audio input mode: • MIC • AUX • OPT
⑧	VOL Boost*	+8dB higher in Optical input mode when enabled.

(*Available in Optical input mode only)

LED Indicators

No.	Indicator	Meaning
C	Blue	Power on or connected
	Green	Volume Boost function is enabled
	Flashing red & blue	Pairing mode
D	Flashing white	No valid audio signal detected
D	Solid white	Valid audio signal detected
E	Red	Charging
E	Off	Fully charged or power off

⚠️Important Notes:
• Please avoid using a TV or computer USB port, or a power bank for charging, as they may not provide sufficient power.
• When using your Avantree transmitter with a TV in Optical or HDMI ARC mode, it is essential to set your TV’s Digital Output Audio Format to PCM (Pulse-Code Modulation) to avoid audio issues. Find out more here.
• No sound from your headphones after setup? Troubleshooting guide here.
• Want to hear audio from multiple devices—like a soundbar, TV speakers, and headphones—at the same time? Check out this guide.