Automatic restrain high intensity's voice, dependable protect behind hold equipment.
Effectively decrease serious echo in open room by concave antrum.
0.8mm pinhole and resonate cavum with precisely calculation, reception much clear.
The patent that long distenced transmission (Audio cable Max. 3km).
Audio cable: 4 cores line, network's twisted pairs, shield cable average can usage.
Widely working temperature range (-25℃ ~ 70℃). Built-in lightning stroke protection and power protection circuit. Built-in preamp, direct drive speaker,recorder, DVR,VCR. Widely used in: Police, Monitorship, Judicatory, Safety, Army's department.
