3M Peltor SportTac Headsets offer adjustable hearing protection for hunting and shooting. The headsets feature an intelligent, instant-response, level-dependent function to help protect your hearing from sudden loud noise. It has an audio input for external radio and a foldable headband. Smooth level dependent function, protects the user from sudden loud impulse noise, Equipped with automatic shut-off function, Interchangeable shells make it easy to change colours, Collapsible headband for easy storage, Battery life span: Approx. 600 hours, Audio input for external radio EN352-1:2002 EN352-4:2001 EN352-6:2002.