Bluetooth Headphones QY8 Sweatproof V4.1 Wireless In-Ear Noise Reduction Headphones with Microphone for Running & Sports Bluetooth Earbuds Stereo Headset Earphones for iPhone, Smart Phones (Black) 1. CVC NOISE REDUCTION 6.0 TECHNOLOGY: with superior sound isolation, efficiently reduces unwanted sounds and outside noises, and hands-free phone conversation, so nothing breaks your concentration. 2. TRAIN WITH THE BEST SOUND: with two powerful audio drivers on each side, our sport headphones offers you dynamic, balanced audio and perfect crystal clear sounds. 3. BUILT-IN-HD-MIC: the hand free headset built-in-hd microphone transmits your voice with the sharped quality, so family and friends can hear every word without trouble. 4. NEVER FALL OFF WHEN YOU DO SPORTS: ergonomic in-ear headphones design to specifically fit the contours of your ears, so they stay in place even when you're running, jogging & exercising or other activities. 5. LATEST BLUETOOTH 4.1 TECHNOLOGY: about 7 hours playing time/talking time, 1-2 hours charging time, and about 175 hours standby time. Easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices; Can connect to 2 phones at the same time, and you will not miss any important calls.