Product Feature: High quality. Excellent Sound Quality. Well design and easy to use. Seamless switching between music and calls. Great sound with control. The headset supports Bluetooth v2.1 + EDR with handsfree, Headset, A2DP ( Stereo Music) and AVRCP ( Audio Video Remote Control) profiles. Frequency Response is 22-18000 Hz and Total Harmonic Distortion is less than 0.5% . Music & Talk time up to 6 hours, Standby time up to 130 hours. Fast charging: up to 75 minutes of music time with 20 minutes of charging. Operating distance: 10m. Range of frequency: 2.4 to 2.4835GHz ISM band. Compatible with: Various Bluetooth enabled devices, for example mobile phone, PDA, laptops, etc. Packet content: 1 x Bluetooth Headset 1 x Charger ( US/ EU Plug ) 1 x User Guide