Bluetooth Headphones Qy8 CSBROTHER V4.1 Wireless Stereo Bluetooth Headsets with Mic for running In-Ear Noise Cancelling Sweatproof Sport Earbuds Headphones for iPhone,iPad and Android Perfect High-quality Sound: bluetooth headphones with mic sealing with unique cavity structure design, increase 20% effective area in vibrating diaphragm , adopt CVC6.0 smart noise reduction technology, own clear bass resonance, built-in HD microphone provides you a high fidelity and stereo sound QY7 Upgrade Version: QY8 bluetooth wireless headphones has a higher profile,equipped with Bluetooth 4.1and CSR 8645 Chipset strengthen the signal 2 times , Compatible with most Bluetooth-enabled devices with 10-meter working distance, no delay and no noise Super Endurance: sport bluetooth headphones built-in high-quality polymer battery (80mAh), 2 hours charging time ,up to 5 hours music time and 175 hours standby with a single charge. Stable Connection: behind neck bluetooth headphones with comfortable and secure ear-fitting design for all exercise, offer you a stable connection ,make easy accessible on-ear controls and get rid of troublesome wires tangling while you control your music or calls. Simple-to-use: bluetooth headphones working out control all functions of your music and calls via simple user interface . If you are not satisfied, we provide any refund or return service.