Nothing Worx. You’re better off buying a goat than a Worx lawnmower.
I purchased a Worx cordless lawnmower and it was defective right out of the box. I noticed that something was wrong because the electrical cord from the start button to the motor was too short. I could not assemble the handle because there was not enough slack in the cord. I detached the cord from its clip and tried to assemble the handle. Then I saw that the handle was entirely out of alignment with the frame. You could not lock the handle in position. It was loose, and it could collapse or flip out of position. When mowing uphill, that would let the mower roll backward onto me. So I didn’t risk my safety trying to get a defective product to work. Now I have to go through the hassle of returning it. Worx is the wrong name for this brand. You might say nothing Worx.