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Noise canceling wireless headphones with Microphone and carrying case listen to music wireless the industry-leading Bluetooth V4.2 technology enables you to experience the excellent performance within up to 10 meters range. All-day music pleasure supports up to 4.5 hours out time with only 1-2 hours charging needed. How to pair the headphone1. Press and hold power button for approximately seconds until you see the blue/red flashing LED lights. The headset is now in pairing mode2. Turn on the Bluetooth function on your device and find "3700a".