Is the Viper 550 ESP an alarm system that when you barely hit the car it chirps and when you hit it a little harder it goes off no matter where you hit it? Can you roll up and down the windows from the remote also? Also I found the 550 ESP on ebay for $100.00 with 2 days left and the person said that they bought it from a pawnshop and it has never been used. Do you think this would be worth buying? (I really want a system that is sensitive like ive heard the 550 ESP to be)