Model Number: HRE-6260 Brand Name: GREEN CENTURY Key Specifications/Special Features: Product introduction:Put the microphone in the throat, it have good anti-noise function by the strong throat vibration. Extract the voice to the ears through the acoustic tube ad convenient for use with helmet and gas mask and so onProduct features:Durability & reliability & high sensitive for discreet communication Designed with vibration sensor & suitable for very noisy environment can eliminate noise and avoid echoes Big revolving clips or finger PTT(Push to talk) available. Acoustic Tube earphone A variety of plugs and PTT for your choice & available for all kinds of two way radio brandsApplicable people:Apply to fires, polices, industrial, mountain climbing and so on. This product can be compatible with all Huari PTT