Clear sound transmission; dual electret microphone and 50mm diameter speaker of walkie talkie headset provide clear and loud sound transmission ^^ Noise reduction; two way radio headset with mic has good noise reduction effect; it can achieve clear communication in a noisy environment such nascar racing utv atv agricultural industry; effectively improve work efficiency ^^ Strong and sturdy; the elastic metal bracket of walkie talkie headset with mic is durable to use; in addition; use of kevlar type PU wire effectively extends service life of headphone ^^ Volume adjustment; there is a volume adjustment knob on 2 way radio headset earmuff; you can easily adjust the sound according to the environment you are in ^^ K head 2 pin; for most Retevis Radios; compatible with Baofeng Kenwood Rugged Radios pxton Samcon Arcshell AnyTone Radios etc; for example H-777 H-777H RT21 RT22 RT68 RT-5R NR10 RT86 RA89 RA79 A1 C2 RB26H RB66P; compatible with Baofeng UV-5R 5RM BF-F8HP BF-888S AT-D878UVII Plus etc; not compatible with Motorola and Retevis B3 series walkie-talkies