Selectec Bluetooth Headset Wireless Earphone Sweatproof Stereo Headphone In-Ear With Microphone for Sports Hiking Running Suitable for Common Android IOS and Other Bluetooth Phone Devices Advanced Technology with bluetooth 4.1 and 4.0+EDR (fully backward compatible) for longer playing time, the headphone ensure high-fidelity stereo music and clear speech via Noise reduction within 10 meters Easy and fast pairing with all iPhone, smartphones, tablets and other bluetooth enabled music devices; the simple user interface on one of the earphones allows you adjust the volume, play/pause, select songs and answer/hang up calls completely effortlessly Long lasting usage, the powerful rechargeable battery just need to charge about 2 hours, it allows up to 7 hours talking time, 6 hours music time and 160 hours standby Comfortable and secure design, rubber adapters and custom earbuds ensure you get it perfect fit and remain stable in your ear when running, exercising and other outdoor sports Full Control, it can pair two phones at the same time, allow you answer the phone anytime and anywhere; thus it is lightweight and portable, will not cause any burden to the ears, but providing lasting wearing comfort and convenient to carry.