Using your Behringer BH470NC headphones is easy. First, turn on the headphones and use the built - in NFC to pair them automatically with your Bluetooth device. If you don't have NFC, you can also pair them manually. To enjoy noise - cancelling, just switch it on. The headphones have a long - lasting battery. You can get up to 30 hours of Bluetooth playback without noise - cancelling and 20 hours with it on. When the battery is low, use the fast - charging feature. A 5 - minute charge gives you up to 2 hours of wireless playback. For clear phone calls, the built - in CVC 8.0 technology will isolate your voice. The adjustable headband and soft ear cups ensure comfort during long - term use. Keep the headphones in the included carry case when not in use to protect them. Don't expose them to extreme temperatures or moisture. Clean the ear cups gently with a soft, dry cloth regularly to keep them in good condition.