Pineapple Rumble KW Bone Conduction Headphone (Black) (Discontinued by Manufacturer) Bone Conduction Headphone offers the True Bass woofer Sound through the bone conduction Noise Isolation Headphone and Low Air pressure to your eardrum which can reduce the hearing damage. Built-in both Bone conduction and Air conduction technology Wide Frequency range of 20 Hz - 21 kHz delivers the dynamic detail. 100% Water Proof The Bone Conduction Transducer converts electric signals into mechanical vibrations