HP80EX explosion-proof high noise reduction intercom communication earphone with national explosion-proof number CNEx22.2750X has Ex ib IIB T4 Gb explosion-proof grade, built-in PTT intercom control, and PTT key can facilitate users to trigger transmission at any time. Equipping high noise reduction communication earmuff. Can be equipped with a variety of noise reduction level microphone, suitable for different working environment. The moldable and waterproof microphone arm is convenient for users to freely adjust the transmission angle. The built-in volume adjustment knob can adjust the volume at the earphone end. The noise-canceling microphone can ensure clear transmission even in a high-noise environment.# Hua 'an Jiexun Interphone# Public Network Interphone# Interphone# Interphone# Digital Interphone# Interphone Rental# Interphone Maintenance# Explosion-proof Interphone# HP80EX Explosion-proof High Noise Reduction Interphone Headset# Explosion-proof Interphone Headset# Multi-interface Explosion-proof Interphone Headset# Heavy Explosion-proof Noise Reduction Headset# Youlitong Interphone# Interphone Explosion-proof Headset# HPogue-proof High Noise Reduction