Beyution wireless bluetooth headset headphones bluetooth 4.0 Headphones with noise cancellation technology----Retail package New HiFi Wireless Bluetooth V4.0 Headphone Headphones headset for Cell Phone/Laptop/PC/Tablet HiFi - Best Audio Performance - Stereo - Bluetooth V4.0 Version --33 feet distance - Over the head Built-in microphone 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 5-6 hours of talk time or audio playback, Standby time up to 180 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.