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See the fact on being safe is some 50lb Ice fishing line and some rubber bands and I use the smallest I screws Then get some of the $1 door and window alarms from the dollar store. Put the 2 parts of the alarm together with the rubber bands and tie the line on....anyway you get it Dollar Tree has them. This works very well. These scream LOUD for what it is. Just something I have used. Put the line off the ground a littil waws so every little animal makes it go off. Test them before counting on them 100% Ive had 1 not work.