Main Features: Adopted with Bluetooth 4.0 and CVC 6.0 noise cancellation technology， enjoying high quality of talk and music. Up to 180 hours stand-by time， 3.5 hours continuously talk time. It could realize work-family balance which pairing two mobile phones at the same time. The aluminum alloy design and the use of silica gel earmuffs， you can feel that the new machine fine craftsmanship and comfortable to wear.Bluetooth Protocol: HFP / HSP / A2DP / AVRCP / CVC Output Power: 10mWWorkable Distance: 10m ( Barrier-free space )Working Time: 3.5hours for talking time， 3hours for playing musicStand-by: 200hoursCharging Time: 1.5hoursCharging Voltage: 5VDrive: 10mmSensitivity: 90dB + / - 3dBImpedance: 32ohms + / - 15percentageFrequency Response: 20 - 20000Hz Communication: Wireless Function: Bluetooth，Microphone，Noise Cancelling Style: In-Ear Use: Computer，Mobile phone，Portable Media Player，SportPackage weight: 0.177 kg Package Size(L x W x H): 10.00 x 3.50 x 17.00 cm / 3.94 x 1.38 x 6.69 inchesPackage Contents: 1 x Awei A825BL Earphone， 1 x User Manual， 1 x USB Charging Cable， 1 x Ear Hook