I bought this set as a back-up. Uses 2 AAA batteries, one on each side. Also 2 switches. No auto shut off feature. Takes a long time to react to each shot. With only 2 shooters on the range, seldom cut off the shot. With many shooters, seemed fine. Amplifies voices well.
I purchased this to keep in my purse for protection in case I'm ever robbed or attacked. I was impressed with the power of the electric volts just by pushing the button. I did like that there is a child safety feature and that it can be turned on and off.
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