w4yne

I need to setup some sort of sensors around my car on my drive and something inside the house to alert me if someone is near my car, i have had big scratches along the car 4 times while on the drive. Dont have a clue what i could use so thought i would ask on here to see if anyone knows something cheap i could setup, i did think of wireless cam but that wont alert me unless i watch it all the time. I dont want to alert them i know that they are there because i want to catch them. Is there some sort of wireless or hard wired sensor that could send a sgnal to a device in the house that either makes a alarm or lights up. a alarm would be better. Any ideas?