Howard Leight by Honeywell Impact Sport Sound Amplification Electronic Shooting Earmuff, Real Blue

22 dB Noise Reduction Rating (NRR) Sleek, extremely low profile earcup makes this a very versatile earmuff for most shooting environments Efficient, low-energy consuming with 4-hour shut-off, delivering 350 hours of battery life. AUX jack connects to MP3 players and scanners. Up to 4X amplification makes it easy to hear range commands and conduct conversations, while internal circuitry automatically shuts off dangerous impulse noises above 82dB.