Just took mine apart tonight to clean it, the buttons were sticking due all the crap from my pockets gumming up the works! on the the pcb there are four buttons! two for lock and unlocking and two others that there is no actual button on the outer case for well I had to know what they did or if they worked or not? and......... one is for the rear hatch (didnt work maybe its not an option on UK models and not programmed into the system?) and the other one is the PANIC button which does work and I have now found a seller on Ebay that sells the three and four button remotes and all you have to do is swap over your battery and pcb and you too can annoy the neighbours at all hours of the night