The timer never goes off on the time I set it, its always like half an hour later or so. Whats even far more annoying is the fact that as time goes by, the lights go on later and later and later until finally I have to re-do the settings. I have no idea what causes this but it is damn annoying. Another really annoying thing is how hard to it is to set the timer tabs. Some of them are so stiff that I had to use tools to push them up or down in fear of my nail breaking off. Dont waste ur time with this product. Biggest piece of junk timer there is on the market.