How do you set an automatic timer for christmas lights?

We have an old christmas light timer with no brand name on it...and need some help! Any advice would be appreciated...does anybody know how to set these things? It looks like a little black box, with 3 plug outlets on the bottom, a digital timer screen on the front, and a little cord sticking out of the top. Thanks... show more We have an old christmas light timer with no brand name on it...and need some help! Any advice would be appreciated...does anybody know how to set these things? It looks like a little black box, with 3 plug outlets on the bottom, a digital timer screen on the front, and a little cord sticking out of the top. Thanks a bunch!
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