SWIMMING: MP3 MODE ONLY, Bone Conduction Open Ear Headphones: Different with traditional design, our open ear bluetooth headphones wont cover your ears very tight so can wear long time and still feel comfortable. The swimming earphones also ensure your safety while swimming, snorkeling, biking, hiking, and other outdoor activities. Note: Bluetooth mode is not supported underwater, ***Swimming requires MP3 mode-*** Dry mic after swim for clear calls***IP68 Waterproof Swimming Headphones - Designed specifically for swimmers, these lightweight headphones feature an IP68 waterproof rating that protects against water immersion, sweat, rain and dust, making them perfect for swimming (with caps/goggles), snorkeling, boating. The nano-coated sealed design ensures internal protection while maintaining comfort. Note: Bluetooth signals cannot be transmitted underwater, please switch to MP3 mode MP3 and Bluetooth Dual Mode: These versatile underwater headphones feature both Bluet