Leakage reduction sound with great sound: Nank Runner Diver2 features exclusive "OT Leakage Reduction 3.0" for a comfortable, low-vibration experience. 90% less sound leakage with a seamless design. Features a 16mm dynamic vibrator speaker for an open sound. Built-in Noise-Canceling Microphone: The Runner Diver2 swimming headphones feature an integrated noise-canceling microphone. Thanks to the upgraded second-generation waterproof structure, the inclusion of the microphone channel does not compromise the headphones' waterproof performance, ensuring reliable stability. IP68 Dustproof and Waterproof: With an IP68 rating, Nank Runner Diver2 is ready to explore the world with you, and join you in the shower afterwards. Hit the beach or the gym. Don't let rain and sweat spoil your fun. 10-hour play with fast charging: The running headphones are equipped with a 180mAh battery, providing up to 10 hours of usage on a single charge (at 60% volume). The headphones support fast charging, allowing a full charge in just 1.5 hours, ensuring prolonged use during your workout sessions. Bluetooth 5.3 with MP3 player: Nank Runner Diver2 transmits excellent sound quality directly through your skull, allowing you to enjoy quality music while protecting your hearing to reduce the burden on your ears, while also allowing you to be aware of your surroundings, making outdoor sports safer.