All of our items are . A remote microphone with push to talk button you can clip anywhere. Sponge earpad earpiece fits snugly in your ears, which keeps your conversation private. Headset microphone can be placed on your mouth, which makes conversation more convenient and simple. Applications: Relevant personnel: police, , bouncer, and businessman. Related sites: nightclubs, bars, , security, restaurants, hotels, airports, casinos, manufacturing plants, conventions, concerts, warehouses, and noisy environments. 2-pin standard diameter: Ear 3.5mm stereo (top pin). Mic 2.5mm stereo (bottom pin). Space of two-pin: 11mm. Color: Black. Weight: 70g Speaker DIA: Diameter 15+/-0.5mm. Impedance: Diameter 20mm 32ohm +/-15%. Sensitivity: 103dB+/-3dB Frequency. Response: 200Hz - 3.5 KHz. Microphone Size: 6.0 X 5.0mm -54DB+/-2. Material: plastic Package Contents: 1 * headphones Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.