BUILT-IN MAGNETS - You can connect the two earbuds together when not in use and wear them around your neck like a necklace. It's a convenient method that you can take with you when you don't need it. BLUETOOTH 4.1 STABLE CONNECTION - Advanced BT V4.1 technology can pair earphones with mobile equipments and play music and call with clear voice. SERVICE TIME - Built-in 60mA battery provides approximately 3 hours of uninterrupted music, 2 hours of talk time, and 160 hours of standby time on a single full charge. SOFT EARPLUGS - Wireless Earphones With soft rubber earplugs, your ears will never feel pain easily. CONTROL FUNCTION - You can answer / hang up / reject / redial calls, adjust volume, change songs, play / pause music through bluetooth headset.