Yikes, quite a few reported problems on Amazon (two excerpted below). I've had mine for a few years without problems. It's plugged into a surge protector, if that matters. The unit does get a little warm as M. Williams reported. I bought it at Home Depot.
Albert Wiersch wrote:This was wonderful while it worked, then stops working after a few months, even when you put in fresh batteries. At least mine did. And I've had other very unreliable Intermatic products like a wall timer switch which was amazingly unreliable. I was hoping this would be different. It was indeed better than the wall timer switch, but it still breaks after a few months of use (stops being able to turn things on and off- problem with the relay switch inside?).
M. Williams wrote:I bought one of these and it lasted about a year so I took it apart and found that it had a bad solder connection so I fixed it and lasted one more year then would no longer switch on devices, so I took apart again, found that a diode went bad, very poorly designed power supply there is a resistor that gets overly hot. Now I've power it with a transformer and so far so good. Please note this is the only digital timer with 14 on off settings and that has battery back up, that I could find.