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V. Advanced operation

5.1 Pairing your headphones with a mobile device

1. Press and hold the power button for 3 seconds to turn on the headset. When 

powering up for the first time, the headphones are discoverable for 2 

minutes and are ready for pairing. The LED indicator alternately flashes 

green and blue. 

2. Set your Bluetooth

®

 phone to ‘discover’ the wireless headphones. 

3. Place the phone and headphones within one meter from each other. 

4. Select the XTH-M660IM/XTH-M660CA headphones from the list of newly 

discovered devices in your phone.

5. Your device will confirm when pairing is complete. The LED indicator glows 

in green.

6. If after 60 seconds the pairing process fails, please repeat steps 1 through 5 

as described above. 

7. When not in use, turn off the headphones with your phone once, as it will 

pair again automatically.

8. The automatic re-pairing feature will allow the headphones to be 

reconnected after being switched back on or when placed again within 

wireless range.

 

5.2 Call management using your wireless headphones

• When there is an incoming call press the phone button to pick it up. You may 

also press the answer button on your smartphone to receive the incoming 

call.

• To end a call, simply press the phone button once again.

• To reject a call, press and hold the phone button for about 2 seconds.

• Press the phone button twice to redial the last number called. 

5.3 Music playback

• Press the play button to start and stop audio playback.

• Briefly press the previous track/volume – and next track/ buttons to 

go to the previous or next track.

• Press and hold the volume – or the buttons to decrease or increase 

the volume level on the headphones. 

• When listening to music using your smartphone, playback will pause to allow 

the call to go through. 

• As soon as you hang up, music playback will resume automatically. 

VI. Troubleshooting

If you cannot connect the headphones to your phone do as follows:

• Ensure that the headphones are charged, switched on, paired with, and 

connected to your phone. 

• Make sure that the Bluetooth

®

 feature is activated on your phone.

• Check that the headphones are within 30 feet of your phone and that there 

are no obstructions between the headset and the phone, such as walls or 

other electronic devices.

VII. Technical specifications

*Estimated battery run time depending on usage and volume settings 

**3.5mm stereo cable not included

Headphone

Form factor 

Driver unit 

Maximum power output (R.M.S.) 

Frequency response 

Signal to noise ratio 

Impedance 

Sensitivity 

Color 

Microphone

Form factor 

Directivity 

Frequency 

Impedance 

Sensitivity 

Volume control 

Battery

Battery type 

Battery charging time 

Battery run time 

Battery standby time 

Charging method 

Additional information

Connection type 

Wireless RF frequency 

Wireless range 

Buttons

Cable length 

Weight 

Dimensions (WxHxD)

Warranty

On-ear

φ40mm

40mW

100Hz~20kHz

80dB

32Ω

115±3dB

Black with red or black with blue

 

Built-in

Omnidirectional

100Hz-10kHz

680Ω

-42dB +-3dB

Yes

 

250mAh rechargeable ternary polymer lithium battery

1.30 hour

Up to 8 hours*

30 hours

Micro USB (5V)

 

Bluetooth

®

JL v5.0, 3.5mm**

2.4GHz-2.480GHz

33ft

Power on/off/play/pause

Volume -/previous song

Calls

/next song

Micro USB to USB: 2.2ft

5.7oz

6.2x7x2.9in 

One year

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