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These units aren't made for three-pronged plugs. Didn't realize it until well after I'd gotten them, because I wasn't using them right away. Have no use for them. I guess they'll go in the "junk drawer".
I am using this to time some grow lights on some house plants. After two months of use, the clock stopped working on one of them, leaving it permanently in the "on" state. I plugged it in to an outlet for a while to see if it would charge the internal battery. It didn't. I tried to figure out how to do the "lifetime warranty" but the company's website says I need the original packing slip from the box it was shipped in. They expect you to keep the packing slip forever, seriously. On top of all of this, I tried to repair it myself only to discover the manufacturer used 3-prong security nuts to hold it together. Literally WTF.
I really thought I had found a great product. The first plug lasted 6 months and then just died. The screen is blank and there is no output of electricity. I got the other one out. The screen works but not output of electricity. I have never used it.
A waste of my time mostly, I'm never buying one of these programmable timers again. Luckily I also purchased two mechanical ones as well and they were setup and put into use immediately w/o any issues. The mechanical times are doing just want I need the to do. Keep it simple and buy the mechanical timers.