With the waterproof Bone Conduction Bluetooth® headphones, you can listen to music and ambient sound at the same time. This is due to the special wearing method. The Lenco HBC-200 is not inserted in your ear but rests on the small bone at the beginning of the ear canal, the sound is sent to your ears via vibrations. This is called the Bone Conduction Technology. As there are no plugs in your ears, all the ambient noise remains audible, this allows you to exercise safely outside. You also no longer have to deal with caps that irritate of fall out of your ears.