MT13H221A 3M PELTOR ProTac III 3.5 mm Jack Plug Electronic Ear Defenders with Headband, 32dB. The 3M™ Peltor™ ProTac III headset is designed for use in tough and noisy environments. With a level dependent function and hands-free use with voice guided menus these Peltor ear defenders combine comfort and wearability with functionality for improved efficiency within your workplace operations.