I just bought the truck with it- at first, I could hit the remote start twice, to turn the truck on. It never did lock or unlock it-now the remote won't start the truck anymore. The front of the starter has an led screen with a car picture and battery indicator. There is 4 buttons- lock, unlock, key pic and a button with a questionmark/ camera pic. There is also a button on the back with a 'P' on it. It uses AAA batteries. I did put a fresh battery in it. Thanks!