1.Two way radio headset with boom mic offer crystal clear audio; great use in noise background 2.K head connector: Ear 3.5mm stereo (top pin). Mic 2.5mm stereo (bottom pin).Space of two-pin:11mm.Compatible with Kenwood Baofeng Wouxun and many other radios. 3.Suit for Kenwood PUXING Baofeng UV-5R Retevis H777 RT21 RT22 2 Way Radio 4.Baofeng headset with mic,Tactile PTT provides hands free communications without holding the radios. 5.Excellent for use in police, military, nightclubs, bars, paintball, security,restaurants, hotels, bouncer, warehouses, and noisy environments.