3M MT13H221P3E ProTac? III Headset, Cap Mount Style, 23 dB – Each

Environmental microphones for level-dependent hearing protection and ambient listening
3.5 mm listen-only stereo input for connection to external devices (e.g. cell phone, two-way radio, IPod)
Voice-guided menu system for ease of use and adjusting settings
Auto power off, the headset will turn off after 4 hrs of non-use to save battery
Low-battery warning to inform you when to change batteries
To reduce corrosion caused by sweat and moisture, the electronics are located in a separate compartment of the cup
Occupational use only