Beyution Smart Stereo Wireless Bluetooth Headphone---for Apple iphone series and all IPAD IPOD series; SAMSUNG GALAXY S4/S3; Nook; Visual Land; Acer; Coby; Ematic; Asus; Hisense; Supersonic; Adesso; Filemate; LG and all portable deive which with bluetooth device This 2nd generation bluetooth V4.1 headphones. bluetooth 4.1 advanced technology. Bluetooth 4.0 technology is 8 times the bandwidth comparing with the bluetooth 2.1 standard. We promise this new 2nd generation Bluetooth V4.1 headphones has best audio performance, with 30 days quality warranty! We are a USA Seller, support quick shipment and rapid response. We promise to solve any query for each customers within 36 hours(PS use amazon message system). Built-in microphone with noise cancellation technology, Allows clear Phone communication; Enables use as a headset. Music and phone controls ensure ease of use Built-in rechargeable lithium-polymer battery With Li-battery enables up to 7-8 hours of talk time or audio playback, Standby time up to 200 hours. Passive noise reduction Up to 15dB blocks background sounds for an immersive listening experience. Noise Blackout with dual microphone technology promotes optimal call quality.