tried this too, seriously reverse after getting the tic wont work, lucky the management that time consider it as a ticket rosak n ask me to pay the parking amount only since the time printed on the tic. Just tailgate your fren when out, it works everytime, as long as u stick close enough you gerenti able to get out before the palang close, no alarm nothing I think the sys tot is 1 car, pick exit with no guards la ofcoz