What is bone conduction? "Bone conduction" is a technology that "uses bones as the transmission medium to hear sounds." The principle of bone conduction headphones is that the sound output by the headphones is transmitted through the bones to reach the inner ear (auditory nerve) directly without vibrating through the sound The ear tympanic membrane and bring sound. The advantages of bone conduction headphones First:Bone conduction headset because of the different principles it will not hurt your ears, which is different from ordinary headphones or earphones. Second:When you normally answer the phone or enjoy the music will not block your contact with the outside world. You can hear the voice of the outside world, whether you are listening to music or walking in the street! Car horn, doorbell, talk with friends, can be normal. Specifications: Earplugs/earmuffs Material: Silicone Headphone Cable Material: PVC Color: Black Plug Diameter: 3.5mm/TYPE - C Whether Wireless Headset: Wired Headset Weight: Approx. 33 g With or Without Microphone: Yes Impedance: 32 (?) Sensitivity: 58 (dB) Wire length: 2 (m) Speaker diameter: 40 (?mm) Frequency response range: 20-2000 (Hz) Package content: 1 * Wired Bone Conduction Headphones 1 * Noise Reduction Earplugs 1 * 3.5mm Connection Cable 1 * TypeC Connection Cable 1 * Instruction