Features 1. The built-in directional microphone can amplify ranging commands and other environmental sounds to 82 decibels, making hearing more natural and communication more effective. 2. Proactively monitor and automatically turn off the amplification function when the ambient sound reaches 82 decibels. 3. The noise reduction level (NRR) is 22dB. Can be used for cleaning gun stocks, adjustable headband to ensure safety. Compact folding design for convenient storage. 4. Integrated power or volume knob - includes AUX input and 3.5mm cable for MP3 player and scanner. 5. It has an automatic shutdown function (when there is no operation after 4 hours), which can extend the battery life. The battery has a long capacity and can play for about 350 hours. Specifications Type: Anti noise earmuffs Product weight: approximately 1 pound, approximately 1 pound Product size approximately 11 x 10 x 4CM (single earbud) Battery type: 2 AAA batteries (not included) Style: Ear cushions Material: ABS plastic ABS plastic Energy: Battery Powered Battery Powered Sound level: 24 decibels Measurement System English or Standard Special Function Noise Reduction Rating (NRR): 22 decibels Purpose: Passive protection Passive protection Comes with components such as Impact sports earmuffs and a 3.5 audio interface Does it include a battery No, no Average battery life: approximately 350 hours Package Include: 1x noise cancelling earmuffs 1x 3.5MM audio cable 1x User Manual