***** **********Best Quality Guranteed. *****The remote clip allows clip it to collar close to mount for convenient transmit; making your conversations discretely*****High impact plastic with strong swivel design for convenient using*****Sounds clear than other general speaker mic on the market; PTT button is large and easy to use with gloves*****Ear 3.5 mm stereo (top pin); mic 2.5 mm stereo (bottom pin); space of 2 pin; 11mm*****Compatible with H-777 RT21 RT22 RT-5R RT17 RT18 RT19 RT27 Baofeng UV-5R series BF-F8HP BF-888S Arcshell AR-5 Kenwood two way radio and more