3M Peltor MT15H7P3E SV Tactical Pro Listen-Only Hard Hat Mount, Hearing Protection, Ear Protection, NRR 22 dB, Ideal for gun ranges, forklift drivers, airport ground personnel, and maintenance mechanics NRR 26 dB Ambient listening electronics provide distortion free, amplification of low level sounds up to 14 dB Audio jack for radio input monitoring Incorporates new ASIC technology Auto shutdown power saving feature