Hmusic Open Ear Headphones, Bluetooth 5.4, Diamond Shape Air Conduction Wireless Earbuds with ENC Mic, 15H Playtime IPX5 Waterproof Bluetooth Headphone for Sports, Running, Hiking, Cycling, GymOpen Ear Air Conduction Headphones】this wireless headphone adpots the principle of air conduction, which can effectively prevent sound leakage and transimit music clearly, allowing you to enjoy the music while notice your surrounding sounds. And the open ear design makes you feel comfortable and no fatigue for long time wearing.