Features: brand new and high quality Bone conduction painless wear: Works through vibration and transmits sound to the inner ear through the cheek bone.The back is equipped with an adjustable strap, which can be adjusted to the most comfortable wearing effect according to your for head circumference, avoiding the problem of swinging up and down during exercise. IP68 waterproof&underwater: Deep waterproof headphones, you can wear bone conduction headphones while surfing, swimming, or even bathing, without taking off the earphones. While enjoying the music, you can also hear the surrounding sounds to ensure your safety.You can listen to the downloaded songs while using the headphone underwater without worrying about the signal. Large battery&Fast charge: Bone conduction headphones have a built-in 350mAh battery. You can enjoy music indoors and outdoors without worrying about running out of power.During swimming training, you don'for t need to worry about charging your earphones halfway through, and will swim with you until the last minute. Built-in 16G memory: The bone conduction headphones itself can store about 4000 songs, supports dual playback mode, allowing you to get rid of your mobile phone and run music with you. 5.1 has faster transmission speed and connection speed distance, no delay, for play as you want.The built-in microphone and fully enclosed cavity bring better call effect, and the sound is not leaking and more concealed. Glasses not affect wearing: It is Sinking streamlined design and comfortable to wear, ensuring that You wear glasses move freely without worrying about falling off.It also does not affect the use of swimming goggles when swimming. Specifications: Material: Plastic Weight: approx.135g Color: Blue/Gray Size: approx.150x45mm/5.91x1.77in Quantity: 1Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x Bone Conduction Headphone