If I want to use one of these on a power strip or 3 prong all I do is use a $2 adapter that has a 3 prong female on one end and a 2 prong male at the other end with a long ground wire for the 3rd prong ground you connect to the center screw of tour wall outlet base-plate. If I need room on the power strip to mount several on a power strip that wont fit I use $1 mini extension cords. The point is you have a larger resource of individual simple timers that can be used on other tanks and in different applications & combination without having to invest a allot of money and not requiring a cryptologist handbook on how to get it working again.CWO - I have the Marineland version of that timer. It wasthe only 3-prong one i was able to find at the time.