Works at approximately 200 yards. little. It is better to spend a little more and get a device with a battery. Batteries are more expensive than the device itself. Personally, I think (I know) I wasted my money, living and learning. The cigarette lighter plug also broke so I don't use it. Also, I refuse to spend $16 for 4 rechargeable batteries when it lasts 9. Think of it as a waste of money for something that doesn't work anyway.
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