My book says model 35/40. Whatever it is, it is powered by a battery that has a recharger on it.
It works fine. Originally had extra arms on it for C-182, took those off and it fits my SR-22.
Works fine, but a little slow up the incline and over the “lip” on my hanger.
Had one problem, the cable that goes to the clutch is right next to the electrical terminals. It slipped off the working end, shorted the terminals, got white hot and eventually broke. Replaced it with a sturdy cable and insulator.