i bought that china machine– interesting— does have a variable speed using a 24v dc motor and speed controller with a laptop type power brick. speed range ok, splash pan a bit high. has a drip bucket that looks to be made of a beer can but works good. a usable machine at $428 but not for competition stones, the price includes shipping from china, i got it in less than 2 weeks, and its a new machine. the head with protractor has no degree stop so its up to the cutter to use their eyes which they should be doing anyway to stop and match at correct degree.