One-step Pairing After pairing the earbuds for the first time, the headphones will instantly connect to your smartphone whenever you open the charging case lid subsequently Dustproof & Waterproof Design With dustproof and waterproof nano-coating on the charging case, the charging compartment is effectively protected from dust & water- improving the life of the headset IPX7 Waterproof Calibree bluetooth headphones boast IPX7 rated protection that resists daily splashes of water, sweat & rain. Perfect for fitness and traveling 2200mAh Power Bank Equipped with a large 2200mAh battery, the charging case can also serve as a mini power bank to charge your mobile phone in emergency situations Ergonomic & Lightweight Ergonomic & Lightweight design provides a comfortable and secure fit that doesn’t protrude from your ears, especially for Sports, Running, Workouts, and Gym Wide Compatibility The wireless earbuds are compatible with mobile phones, laptops, tablets & most bluetooth devices like iOS/Android/Harmony/windows system, etc