Experimental 24" Robotic Scrubber, powered by 2 12 volt batteries. Scrubber is set up to scrub without an operator, however it can also be ran in manual mode. I purchased the scrubber for my own use, but never used it, except for testing. I was not impressed with the automatic mode, but it did seem to run fine in manual mode. I am sure the batteries will need to be replaced after setting for several years.