Bluetooth Sports Headphone, Te-Rich Sweatproof Wireless Bluetooth Earphones [ In-Ear / Noise Cancelling Headphones Earbuds with Mic & Stereo ] for Outdoor Running (Black) Latest Bluetooth 4.0 Technology: Bluetooth V4.0 ( CSR8645 ) Chipset strengthen the signal 2 times , Compatible with most Bluetooth-enabled devices with 10-meter working distance. Support ios / Android device battery display. Sweat Resistant: Te-Rich sweatproof bluetooth earbuds with Wing stabilizers are fit for running / climbing / jogging / camping and other outdoor sports. Provide High-fidelity stereo music and Crystal Clear HD sound. Can connect to 2 phones at the same time, and you will not miss any important calls. Easy Charge: Built-in rechargeable Lithium-poly battery. Can last up about 4.5 hours while listening to music or talking on the phone. This powerful rechargeable battery has up to 175 hours of standby time. Noise Cancelling: with excellent sound effect collection, superior sound isolation, efficiently reduce external noise.