I also like this time of year after the holidays I buy the left over jingle bells in different sizes. The different sizes have different sounds so they are a directional warning devise. Works great for camping. All Jingle bells of one size and tone go on one side of the camp and Jingle bells with a different tone go on the other sides. This way you know from which direction the intruder is approaching.
The same thing applies to doors and windows in the house. The back gate, whatever. I tie them to fishing line but that can be picked up easy enough with night vision.