• Noise Reduction Rating (NRR) 22
• Employs built-in microphones amplify sounds and block hazardous noise
• Users enjoy full, clear directional sound in stereo
• Automatically shuts off amplification whenever harmful sound levels are reached (higher than 82dB)
• Equipped with an external input and connection cord that allows you to connect to your own audio source
• Battery life of up to 350 hours; Automatic shut-off after 4 hours to preserve battery life; Includes 2 AAA batteries
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