4x HQRP Headset PTT Throat Mic for Baofeng BF-888 BF-888S BF-999 BF-999S Radio
HQRP trademarked products. Baofeng BF-888, BF-888S, BF-999, BF-999S. The microphone transmits directly from your throat, so it is not sensitive to the background noise. The throat mic could be easily hidden under the collars too.