Perfect motorcycle helmet stereo headset when driving.<br> <br> Features:<br> Durable and lightweight.<br> 3.5mm jack-plug£¬ fit for all kinds of phone£¬ MP3 player£¬ and other music device.<br> With sticker design£¬ can be easily installed on the inside of helmet£¬ convenient and comfortable.<br> Adjustable microphone£¬ make telephone calls anywhere anytime.<br> Volume controller makes you use more easily.<br> <br> Specifications:<br> Color: Black<br> Compatible: 3.5mm jack-plug£¬ all kinds of digital device<br> Earphone diameter: approx. 3.7cm<br> Cable length: approx. 1.2m<br> Earphone/MIC sensitivity:-58Ddb¡À3db<br> Earphone impedance: 32¦¸¡À15%<br> Frequency response range: 20-20Khz<br> Package Size: 13 * 9 * 3cm / 5.1 * 3.5 * 1.2in<br> Package Weight: 41g / 1.5oz<br> <br> Package List:<br> 1 * Helmet Earphone<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>