C-type earhook headphone comfortable to wear for long time work Length from PTT to earphone about 8.3 inches; length from PTT to 2 pin about 35.4 inches The great replacement for walkie talkies and can provide more convenience Suitable for engaged in retailing entertainment hospitality food service and community management industries Compatible with Retevis 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