Proximity sensors are handy for protecting supplies, campsites and unloading operations. They are very inexpensive and aboutn the size of a cigarette pack. I picked up four on sale at Radio Shack for six dollars each. They require batteries and when someone approaches within an arc they sopund off with a load beep. They are usefull to place around campsites, but I found them helpful when keeping watch over food or supplies in an emergency.. For example a driver cannot watch the open back of his truck while sitting in the cab with cargo half-unloaded and the door open. A sensor will sound an alarm if anyone approaches near the rear of the truck.
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