Semi-functioning foldable treadmill give away for free.
It will run without issue if set below speed 4-5, but will randomly stop when it's set to higher than speed 6. I did some research online, some lubrication and aligning the belt with Allen key should fix it, but I am not handy enough to do it myself.
If you search "Goplus 2 in 1 Under Desk Treadmill Superfit Folding Treadmills", you should see the manufacture specs for it (mine is an older version, but looks pretty similar to the one they now sell).