Kenwood 2 pin; not compatible with any Midland and Motorola walkie-talkies; compatible with Retevis H-777 RT21 RT22 RT68 RT18 RT19 RT27 RT-5R Baofeng UV-5R series BF-F8HP BF-888S Arcshell AR-5 Kenwood two way radio and more Hands free compatible with radios and the acoustic tube fits snugly in the ear and keeps your conversations private Sensitive built in mic with PTT allows you for no-nonsense hands-free calls; great for smooth communications with your partners 360°stainless fixed clip that you can fix the PTT to the convenient place Excellent for use in police military nightclubs bars paintball security restaurants hotels bouncer warehouses and noisy environments