HT41866-Q - Buttons, Indicators & Function Table – Avantree Support

Product Overview (Earbuds)

Button Functions

No.

Buttons

Functions

①

- Click + / - button once to increase / decrease the volume

- Press & hold for 1 second to switch to next / previous track

- Press & hold both for 7 seconds to clear the pairing history

- Tap both once simultaneously to activate voice assistance (only works with phones)

②

Multifunction
Button (MFB)

- Press & hold for 3 seconds to turn the earbuds on / off, or reject a call

- Click once to pause / play audio, or answer / end a call

- From OFF, press & hold for 5 seconds to enable pairing mode

LED Indicators

No.	Indicators & Voice Prompt	Status
A	Solid Blue for 1 second	Power on
	Solid Red for 2 seconds then off	Power off
	Alternate Red & Blue flashes, "PAIRING" voice indicator	Pairing
	Solid Blue, "CONNECTED" voice indicator	Connected
	Blue flashes every 5 seconds	Disconnected
	Solid Pink for 5 seconds then solid Red for 2 seconds	Pairing history cleared
	Red flashes every 5 seconds, "LOW BATTERY" voice indicator	Low battery
	Solid Red	Charging
	LED off	Fully charged

Product Overview (Transmitter)

Button Functions

No.	Buttons	Functions
③		- Click + / - button once to increase / decrease the volume - Press & hold both for 7 seconds simultaneously to clear pairing history
④		- Press & hold for 5 seconds to enter paring mode (for NB16T Black, for NB16T Red) - Once connected, press & hold for 10 seconds to lock the headphones to the transmitter
⑤		Toggle it to turn the transmitter on / off

LED Indicators

No.	Indicators	Status
B	flashes Blue every second	Reconnecting (Leftindicates status, rightindicates status.)
	Alternate Red & Blue flashes	Pairing
	Solid Blue	Connected
C	“AD” solid White	Connected with aptX Adaptive codec
	"ATPX" Solid White	Connect with aptX codec
	"LL" Solid White	Connect with aptX-LL codec
	“SBC” solid White	Connected with SBC codec
D	Solid White	Valid audio signal
D	Red flashes every second	Invalid audio signal