Bluetooth Headphones, V4.0 Wireless Stereo Bluetooth Earphones In-Ear Noise Cancelling Sweatproof Sport Headset Earbuds with Microphone, [Magnet Attraction] MAGNET ATTRACTION DESIGN and SWEATPROOF: The bluetooth headphones is wearable and sweatproof, hang like a necklace around your neck, you can enjoy music when running, gym, sports & exercise and other activities. BLUETOOTH 4.0 EARPHONES: Bluetooth 4.0 and backward adapt V3.0V2.1 and so on. Effective distance is about 10 meters( Depend on environment, mobile phone and headset line distance). HD STEREO and NOISE CANCELLATION: with CVC noise cancellation 6.0 technology, efficiently reduces external noises, high quality HD stereo sound. LIGHTWEIGHT and LONG-LASTING: When full charged, about 6 hours Talking Time /4 hours Playing Time/200 hours Stand-by Time. Light weight, perfect for gym running. Easy to PAIR: Long press the Power button when the device is off. The Blue and Red led lights quickly flashes in turn, hearing pairing. Open your bluetooth phone or other device, search and choose Runner X9 to pairing, then you can hear  connected.