MKT BT-008 Wireless In-Ear Sweatproof Bluetooth Headphones with Mic, Black Latest Bluetooth 4.1 and CSR AB1512 Chipset strengthen the signal 2 times, easy and fast pairing with bluetooth device, audio decode technology provide Bluetooth Headset powerful audio driver balanced stereo audio sound Full control& Comfort fit: line controller with microphone easily changing volume, switching tracks, and making hands free calls; the earphone is lightweight and compact with a flexible earhook, providing a comfortable and secure fit More freedom: 33 Feet of bluetooth connecting distance & Speaking caller ID: allowing you to move freely and stay focused on your workout; the speaking caller ID makes it very convenient to figure out who's calling, as it reads the caller's number, and eliminates the need to look at the mobile screen to figure out the caller. Battery Capacity: 65mAh, Stand by 180 hours around, Sweat-proof & Talk time up to 4.5 hours and with a 2 hours rechargeable battery Intelligent one-driving-two: connecting two devices at the same time. Superb Stereo Sound and Easy Pairing all Android & iPhone ipad and computers with Bluetooth devices