Quartet 2 - Add More Headphones

Put both the base and the new headphones in pairing mode—they’ll connect in a few seconds.

Quick check

1.  Turn on your transmitter (Flex Base).

2.  Press and hold the pairing button () until the “Add Devices” light starts flashing.

3.  Turn on the new headphones.

4.  Hold the power/pair button to PAIR for about 5 seconds until the light flashes blue.

5.  Wait 3–5 seconds—both lights should turn solid when connected.

Most common reason

● The devices aren’t in pairing mode at the same time.

Helpful tip

● Keep the headphones close to the transmitter (within arm’s reach) during pairing for faster connection.

● You can pair up to 100 receivers—including Quartet-Extra 2.4G Headphones – Avantree, Harmony-Extra – Avantree, or Duet-Extra Headphones – Avantree.

Still not working?

●  Turn both devices off, then repeat the steps.

●  Move away from Wi-Fi routers or microwaves (they can interfere).

●  Try pairing again with fewer nearby Bluetooth devices active

Contact us at ✉️ support@avantree.com if the problem persists.