Each earbud connects independently to your device for better connectivity and freedom of use for music and phone calls. Pick up 2 headsets from charging case and they will connect each other automatically, then only one step easily enter mobile phone Bluetooth setting to pair the earbuds. Earbuds and charging case inner coating makes it possible to waterproof for 1 meters deep for 30 minutes. It is suitable for sports to prevent water. Ideal for sweating it out at the gym.