Special ear-hook design makes the earbud will not fall out from your ear during running,jogging,driving or any other activity.The ear-hook with soft PET silicone material you can wear it for a long time without pain.With CSR4.1 smart chip support APT-X,enjoying HD stereo sound Performance.Noise reduct automaticly.Pairing with your bluetooth devices easily and quicky.Lightweight and small maks it perfect for business and workout. Features: Bluetooth V4.1, connect with two phone simultaneously so that you will not miss any important calls. Support music play/pause,adjusting the volume and controlling the songs on the headset for maximum convenience. Micro-USB charging connection Supports Profiles: A2DP, HFP,HSP AVRCP Talking Time: 5-7hours Music playing time: 5-7Hours Charger time:about 2 hours Standby time:about 120 hours Effective range:about 10 meters How to Use a Bluetooth Headset with Your Bluetooth Device 1.Move the switch to on to enter pairing status,Red and Blue LED indicator light flashing alternately and the headset will report. 2.Enable the Bluetooth function of the device and search for available Bluetooth devices, then select "V9" from the search results.If it needs password please enter "0000" 3.Push th power button to on to enter into the pairing status.Then long press the call button and move the volume button to "+" simultaneously about 5 seconds and then release your hand.And the headdset will report.Finally the voice function is successfully switched.