B&Ouml;HM Wireless Bluetooth Headphones with Active Noise Cancelling Headphones Technology - Features Enhanced Bass, Inline Microphone & 18-Hour (Max) Battery - Gold/Tan, B-66 High Compatibility:The best Bluetooth headphones anywhere near this price range, it competes with the top offers from Sennheiser, Bose, Beats, Monster, Bang & Olufsen, Skullcandy and Jaybird. It also works seamlessly with Apple and Android devices. 18-Hour rechargeable battery: charge your wireless headphones for 3 Hours & enjoy up to 16 hours of playtime (18 Hours talk time), answer incoming calls right on your stereo headphones & your music will automatically resume when you hang up. Active noise cancellation: flip a switch on these truly active noise cancelling headphones to block outside noise & hear everything the artist intended. Premium stereo drivers: enjoy thumping bass, prominent mids & sparkling highs with this premium bluetooth headset's 20Hz-20KHz frequency range In order keep the headphine in connection mode press the MFB BUtton (Large button on left earphone) and keep holding it down. After a couple seconds an ascending tone denotes that the Headphones are turned on. When there is double beep denoting the Headphones are in pairing mode. when the headphones have the Noise Cancellation feature active but no Audio streaming through the headphones, there will be some static noise which is the Noise Cancelling waves working. The higher volume the Headphones and Device each are set at can increase the volume of this Noise Canceling white noise. Advanced Bluetooth 4.0: Industry-leading CSR bluetooth 4.0 supports A2DP, AVRCP, HFP and HSP for a fully wireless experience; stream music to your wireless bluetooth headphones from your PC, smartphone, tablet & more with over a 33-Foot wireless range.