Type: Accessories Maximum Range: 3km-5km Dimensions: Space of two-pin: 11mm. Talk Range: on radio Walkie Talkie Type: Portable Frequency Range: on radio Storage Channel: on radio Material: ABS Walkie talkie accessories: Radio headset Radio comunicador: hf transceiver Ham radio: walkie talkie All of 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. Relevant personnel: police, , , and businessman. Related sites: nightclubs, , , 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). Color: Black. Speaker DIA: Diameter 15+/-0.5mm. Impedance: Diameter 20mm 32ohm +/-15%. Sensitivity: 103dB+/-3dB Frequency. Response: 200Hz - 3.5 KHz. Product size: 10 x 10 x 5cm Package Contents: 1 X 2-pin Headphone Only the above package content, other products 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.