3M PELTOR ProTac III Noise Control Earmuffs (MT13H221A)

---------------------------------------------------------------------- Country of Origin: Sweden It has a Level Dependent Function that controls the sound heard inside according to the external noise level. It is battery operated and runs on two AA batteries. It has an automatic power-off function (power turns off after 4 hours of non-use). Comes with a low power warning function. It has a 3.5mm jack so you can connect it to a walkie-talkie or cell phone to listen to audio (cord not included). NRR rating: 26dB Compliant with ANSI S3.19-1974 Headband type