Just wear the SR215 Electronic Earmuffs and they will protect your hear from any harmful noise. The speakers will automatically shutdown when the noise goes over 85dB and in the meantime they will amplify every sound below 20dB around you, wherever you are. This great function will allow you, for example, to hear low sounds in woods. Which is great if you are hunting! The shootersâ€™ friendly tapered shape makes the SR215 ideal for hunters and clay shooters. The sophisticated The SR215 Electronic Earmuffs come with extremely comfortable liquid foam ear cushions and they fold for portability. The SR215 run 2 x AAA batteries (not included).