It is an X-10 system Available under a few names I bought one at the
same time you did. I still have a few lights controlled by the timer.
Now they even have screw in lamp modules.

I started out with X-10 in my home but found them to be very unreliable.
So I switched to Insteon devices (sold at smarthome.com). They communicate
wirelessly in addition to sending signals over the power line. They have
been much more reliable for me than X-10 ever was.

I have modules for our porch lights, the lights on our detached garage, our
hot water recirculating pump, and the fan for our fresh air ventilation
system. I control them all using "Home Control Assistant" software on my
computer.

I tried a few different standalone timers for these devices, but find the
computer control more reliable and easier to work with.

Anthony Watson
www.watsondiy.com
www.mountainsoftware.com