Mild-proof and sweatproof design, while sporting while listening to music although in the rain or sweating Magnet Human engineering design and high quality materials make the headset comfortable for daily use Portable and light weight design, with very easy to store in your bag With CSR4.1 audio decode technology, offering you perfect sound Voice command for picking up / rejecting calls Control music and calls from the headset Allow you to answer the phone anytime and anywhere Suitable for all Bluetooth enabled hands-free handsets, drive more at ease Portable and light weight Specifications: Color: Black Bluetooth chip and Bluetooth version: CSR 4.1 Bluetooth protocol: A2DP AVRCP HFP HSP Battery: 3.7V 60mAh Charging power: 5V / 80mAh Sensitivity: 103db +/- 3dB Impedance: 32Mw Transmission distance: Accessible 10m Frequency: 2.4GHz Talk time: about 4 hours Time: about 5 hours Standby time: about 160 hours