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Noise reduction rating + NRR223 levels electronic restoration of ambient soundSuppresses harmful noise above 82 dBDifferent reminder tones of ON/OFF & restoration adjustingPower by 2xAAA batteries, approx. 350 hours of operation with new alkaline batteries, 4 hours auto shut-off mechanismErgonom..

Noise reduction rating + NRR223 levels electronic restoration of ambient soundSuppresses harmful noise above 82 dBDifferent reminder tones of ON/OFF & restoration adjustingPower by 2xAAA batteries, approx. 350 hours of operation runtime with new alkaline batteries, 4 hours auto shut-off mechanis..

Noise reduction rating + NRR22 3 levels electronic restoration of ambient sound Suppresses harmful noise above 82 dB Different reminder tones of ON/OFF & restoration adjusting Power by 2xAAA batteries, approx. 600 hours of operation runtime with new alkaline batteries, 4 hours auto shut-off ..