Bests & Worsts Reviews from Amazon

This appears to be the same as the Intermatic DT620CL 15 Amp Indoor Astronomic Digital Timer, which I purchased in 2010 and is still working well. There are many reviews for that. There are several secrets to programming this device. From reading the reviews you can tell that some people figured them out right away after reading the directions, some had difficulty, and some never figured them out and returned the device as defective. Secret 1: OK doesn't mean OK. It means cancel the setting I just finished programing. To keep the setting you have to push PROG after setting the minutes. Secret 2: An event is not an on-off cycle. It is just one time setting. To get an on-off you need to program two events. If you program an on time for event 1 and then an off time for event 1 you will find that the on time is gone. You can do on settings and off settings in any order. The device just executes the change of state when that time is reached for that day. Secret 3: You have to push the ON/OFF button when you plug it in the first time after programming it. After that it operates by itself. Secret 4: Dusk and dawn settings override time settings. I didn't set any dusk or dawn events so I didn't figure out the details of this one but if your device isn't going on and off when you expected it to, check your dusk and dawn settings. Secret 5: It may not work immediately after you insert the batteries, causing you to wonder if the batteries are dead or if you inserted them wrong. When it didn't turn on with the batteries in it, I plugged it into the wall socket and pushed some buttons. It came to life and the batteries maintained the display for making the settings after it was removed from the socket. If you plug a cord into the bottom half of the outlet it is then possible to plug in this timer at an angle at the top and it will still work. It is too big to go in straight if something else is plugged in. It is wide enough to take up three spaces on a power strip. You cannot use the socket next to it if you have a four socket outlet on the wall. There is a three prong outlet on each side of this timer. Both follow the same program. Once you figure out how to program it, this is an excellent timer. The secrets I listed are explained in the directions but obviously a lot of us didn't pick up on them at first reading.