RC tech RC026 Electronic Shooting Earmuffs amplifie surrounding low level sounds such as footsteps, voices, warning signals to 82dB yet they provides goodhearing protection from high level sounds from shooting. Noise Reduction: The RC tech circuit helps protect hearing from harmful loud sounds which reach over 82dB, by reducing the amplification of those sounds to a safe level. Volume Control & Directional Sound: Ergonomicly designed volume control knob allows for total adjustment of the two built-in omni directional microphones. 4-Hour auto shut-off function for increased battery life. After auto shut-off wait 5 seconds before turning the earmuffs back on. Battery is not included.