Latest Version: Bluetooth 4.1 Headphones support APT-X/A2DP. With CSR8635 Chip. Provide High-fidelity and natural Stereo Sound with super audio performance.</br>Contact two bluetooth mobile phones at the same time. Built-in HD and sensitivity microphone. Makes you enjoy clear and natural sound when calling.</br>Just say "Yes" or "No" to pick or reject call. With Vol +/-?? and next/previous track buttons. Combine with Voice control function?? such as Siri Control.</br>CVC Noise Cancellation 6.0 technology reduces outside noises?? enable clearer sound from microphone?? you get high quality?? hands-free phone conversation even on the " or inside shopping mall.</br>Stylish Lightweight and Sweatproof perfect for travel or office use?? comfortable fits your ear.</br></br>Product Description</br></br><b>Contact two bluetooth mobile phones at the same time</b><br> After paired the first mobile phone?? please turn off the bluetooth function of the first mobile phone?? then pair the second bluetooth mobile phone. The connection is successful and then turn off the headset?? the headset to open again?? it will automatically connect the two phones. (while two phones are connecting one bluetooth headset?? some functions of the headset will be restricted.)<br><br> <b>NOTE:</b> Pair the bluetooth headset for the first time?? the distance between headset and your bluetooth phone would better within 1 meter when pairing.<br><br> <b>How to pair:</b>Please turn the bluetooth on and Long press the MFB button until the LED light flashing Red and Blue. Then please turn your phone bluetooth on?? it will search bluetooth name "n being connected successfully?? there will be voice telling: y