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The issue is when they see the sign, and that means they know that RF jammer tool they bought will work.

If you’re going to put up a security system sign, make sure it’s for a system that works differently than the one you actually have.

It's also worth noting that you can buy signs and stickers on ebay for way less than the actual system, and you arguably get most of the benefit from the visual indicators.

You are not deterring by having good video after the act! Your video camera recording or not is not relevant to deterrence.

An excellent observation! If deterrence is the goal (and I'm suggesting it often is) then a fake camera is often just as good, but cheaper!

"They have an expensive camera so they have money"