Features: [BT 5.0 Technology] Adopting the most advanced BT 5.0 technology, the earbuds provide one-step pairing, faster transmission speed, more stable connection and lower power consumption. [Premium Stereo Sound Quality] F9 offers 8D surround sound quality with grapheme compound moving coil unit. CVC8.0 noise reduction technology reduces ambient noise and allows you to enjoy immersive sound even in the noisy environment. [Large Capacity Battery] The 2000mAh charging box provides long battery life for daily useafter a single full charge, which only takes 30 minutes. It can be also used as a power bank to charge phone for emergency. [LED-Digital Display Comfortable Wear] LED-digital screen with indicators shows clearly the battery charging status and battery power consumption. Made of skin-friendly material with ergonomic design, the earphones fit well the ear canal and reduce ears pressure, ensuring in-ear wear comfort. [Multifunctional Button HD Call] Voice assistant, volume and music control can be done easily. You can also enjoy HD calls with built-in microphone. [More Practical Features] Life waterproof and sweat proof allow you to deal with daily water activities easily and enjoy sports freely. Memory matching offers great convenience for use. [Universal Compatibility] Widely compatible with iOS and Android systems.