The headset features SoundGuard Plus compression for more intelligible speech. The headset provides ultralight weight of less than 1/2 ounce and soft versatip eartip. The headset has transparent voice tube anti-static design and Quick Disconnect feature clothing clip and compatibility with all phone systems. H31CD boost the incoming audio level to make listening easier in noisy environments. H31CD is recommended for dispatch operators, air traffic controllers, military, stock exchange, 911 dispatch operators. StarSetH31 CD Mono Features: Flexible Earloop Style, Quick Disconnect Feature, Complete w/ 6-Size Eartips, Headset For Noisy Environments, Ultra-Lightweight, Comfortable Behind The Ear, Recommended For Dispatch Operators, Air Traffic Controllers, Military, Stock Exchange, 911 Dispatch Operators, Innovative Design, All Day Comfort, Easy On, Easy Off, Connects To:"