Vsport&reg; Bone Conduction Multifunctional Waterproof Noise Cancellation Wireless Sport Bluetooth Headphone with Mic Stereo & Volume Control for Bluetooth Devices - Black Innovative Bone Condution Technology- Uses vibrations to transmit sound waves directly to the cochlea. Listen to music without blocking your ears, realize free communication! Ear-free Design- Worn over the ear, out of the touch of aurical and inner ear, avoiding the risk of swelling and bacteria growth. Open fit, assures unmatched ambient sound awareness and extended comfort. Avoid the risk of traffic accident and damage to your ears during exercises, let you be aware of the surrounding situation at any time. CSR Chipset, ensures the stereo sound quality of music and phone calls. Bluetooth V4.1, wireless transmission distance up to 10m. Multipoint connection, support 2 phones connection simultaneously. Adjustable headband for tight and comfortable wearing, no worries of the headset falling. Universally Compatible - Suitable for most Bluetooth-enabled devices, such as iPhone6s plus 5S 5 4S and Android smartphones, Samsung Galaxy phones and so on. Sweat Resistant, IPX6- No worries for outdoor exercise. Standby Time up to 120 hours, no need to charge it frequently.