1、Our swimming earplugs use bone conduction technology to transmit music through your frontal bones to ensure that your ears are completely open to environmental sounds. 2、During long‑term wear, you can maximize your understanding of the situation and listen to music while exercising, and being able to hear the sound of the external environment can make exercise more safe. 3、Bone conduction bluetooth headset is the highest waterproof grade IPX8, designed for long‑term use in water. designed for swimming, running, fitness, exercise and other sports. 4、Bone conduction earphones have built‑in 16GB memory and can store about 4000 songs, avoid putting your phone in your pocket during exercise. can be used as MP3, play songs stored in earphones, and listen to songs without a mobile phone during exercise. 5、Bone conduction earphones is built‑in 300 mAh rechargeable lithium battery, strong battery life, can play music continuously for 6 to 8 hours, meeting daily needs. 6、The earphone transmits sound through the bone, you don't need to put the earphone in your ear, protect your hearing, you can hear the sound around you. 7、Magnetic charging, a more convenient charging method, and a stronger waterproof and sealing structure, at the same time with temperature control protection and overvoltage protection, double safety guarantee. 8、Advanced bluetooth 5.0 headset connects to your mobile phone or other devices faster and more stable than bluetooth 4.2, it is compatible with for iOS/Android smartphone or tablet, PC computer and laptop. Item Type: Bone Conduction Bluetooth Headset Material: Liquid Silicone + TPU Model: K8 Bluetooth: 5.0 Support Audio Formats: MP3, WMA, WAV, FLAC Memory Capacity: 16GB Transmission Range: Approx. 10m/32.8ft Waterproof Rating: IPX8 Microphone Sensitivity: -37dB Speaker Impedance: 32Ω Speaker Power: 0.6~0.8W x 2 Charging Time: 2 Hours (Recharge Once a Month when Idle) Battery Capacity: 300mAh Lithium Battery (Shipped with Battery) Playing Time: 6-8 Hours 1 x Bone Conduction Headphones 1 x Magnetic Data Cable 1 x Silicone Band 2 x Card buckle 1 x User's Manual