Bone conduction technology an open ear design and a suite of convenient features deliver premium music play and crystal clear calling without compromise designed with athletes in mind trekz titanium are sweatproof secure and will allow you to hear your surroundings no matter where life takes you in the box headphones carry bag usb charge cable specifications speaker type bone conduction transducers frequency response 20hz20khz sensitivity 100 plusmn 3db microphone 40db p