I didn't have the "Electric Flush" version, but I did have the Thetford 465 manual flush porta potty in my Compact Jr. The only difference is while the manual flush has a plastic bellows bulb you press down on to siphon the water out of the supply tank into the bowl, the "electric" version has a battery
operated sump-pump that you only have to press an "on" switch to pump water from the supply tank into the bowl.
I really liked the size of the thing, more comparable to an RV toilet than a dinky little porta potty not much bigger than a chamber pot. (Gawd, I'm old enough to remember using a chamber pot!)