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I'm not even sure if this timer works or not. The plug on the back is spaced so if you plug it into a standard outlet, it will use one plug, and block the other. I purchased this to free up an outlet as well as control the time, and it's very silly that it blocks the entire outlet.
Great if you don't want an exact timer. For those of us though who would actually like to have the lights switch on and off at the correct times- do not buy this product. I set a 12 hour day and night schedule for my hermit crabs. I set the night one to go on at 6pm. Slowly, the internal clock malfunctioned because the night light would turn on earlier and earlier. Eventually, my night light was going on at 6am while my day light came on at 6pm. Now I just use two night lamps so my animals won't get confused.