Harbour Freight has a wireless alarm that costs less than $15. It has a passive infrared that detects movement (battery operated), while inside the house there is a "chime" device that alerts you to motion. Don't know the range but they are used as driveway alerts for cars entering. When trapping near the house I put one of these and it alerts me when something is caught. Racoons, possums, cats--I don't like to leave anything longer in the cage than necessary. Works very well with an open can of tuna.
I also have one of these near the outside door so that I can feed a stray when they come--otherwise if I put food out the racoons get it first. They know my address!
I also have one of these near the outside door so that I can feed a stray when they come--otherwise if I put food out the racoons get it first. They know my address!