Part Number 10861. Radwell is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers.
These motors have an initial efficiency learn function that needs to be modified with a programming tool mars motors sells for it in order to match the motor resistance to the equipment it's installed in.
I learned that the hard way after buying this unit used and ignorant of the fact, installed it, had it behave crazy, then troll the internet to find a video about installing these produced by a distributor and published on you tube.
$70-ish dollars for the tool and considerable pain of learning curve later, I got things right, and made the very low price paid well worth the "lost free lunch", I thought it'd be a courtesy to the next guy in line to put my caveat out there, but as Ben Franklin was quoted something like "your money is all in your brain" - fear not and tool on.