Retevis 2 Way Radio Headset Earpiece Noise Cancelling Overhead Headset Boom Mic Compatible Kenwood Baofeng UV-5R BF-888s H-777 RT22 RT21 RT27 H-777S RT-5R Walkie Talkies (5 Pack) Walkie talkies headset with adjustable boom microphone pick up sound clearly both in transmitting and receiving Former pin diameter of 3.5 mm and 2.5 mm in diameter after pin with double pin from 8 mm and 11 mm center distance of 2 pin The lightweight and comfortable design create a active noise cancelling environment Durable and soft headsets provides comfortable wearing using experience; great noisereduction function in noise background Simple and Convenient return process; 60 days warranty and 30 days no reason to return