Bluetooth Headphones TOSHENG In-Ear Wireless Hands-free Phone Earphone Sport Earbuds (Blue) CSR 8635 Chip, Breakthrough exclusive technology ensure perfect sound quality. Give you more perfect experience to enjoy music. Bluetooth V4.0+EDR, easy and fast pairing. Good compatibility with most Bluetooth-enabled phones. Multi-point pairing, can connect to 2 cell phones or tablets simultaneously, will never miss a phone when enjoying music. Built-in powerful microphone, one key answer to call/disconnect/redial/refuse to answer, allows you to enjoy the hands-free calling. Sweat-proof, durable, ergonomic earbud design specifically for sports running Built-in rechargeable li-polymer battery. Up to 5 hours of continuous talking / music time. Portable and light weight.