Wireless Bluetooth Sport Headphones YOOYO NFC Function Dual Batteries Earphones Earbuds Stereo Headset Support Wind Noise Reduction for Smart Cellphone (White & Yellow) Works seamlessly with iPhone, android smartphones, tablets, iPod touch, and other Bluetooth-enabled music players, mp3, Bluetooth receivers and stereo devices. It can connect 2 devices simultaneously. CSR 4.0 - Crystal Clear Sound - Stereo - EQ Adjustment - Sports - Voice Prompt - Wind Noise Reduction - Wireless Bluetooth 33 feet distance - In-ear. Signal Plus for skip-free music outdoors. Use your music device left/right side, above/below waist, doesn't matter with Signal Plus. Sweat-proof, durable design, Onscreen Battery Meter, up to 10 hours of Talk/Playing Time and 320 hours Standby Time. Special dual batteries and NFC function make this device used smoothly and enjoy high quality of music life