Both right and left ear can be comfortably wornThe headset fits perfectly in your ear easily to keep your conversations privateRelevant personnel: Police, , and businessmanRelated sites: Nightclubs, , , security, restaurants, hotels, airports, casinos, manufacturing, conferences, concerts, warehouses and noisy environmentsStandard two-pin diameter: 3.5mm stereo (upper pin). 2.5mm stereo microphone (bottom pin)Two-pin space: . 11mmLength: about 1mMaterial:ABScolour:blackPackage Contents:1 * EarpieceOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.