A lawn mower (generally known as mower, grass cutter or lawnmower) is a machine utilizing a number of revolving blades to cut a grass surface to a straight height. The height of the cut grass could be fixed by the look of the mower, but generally is adjustable by the operator, typically by an individual master lever, or by a lever or nut and bolt on each one of the machine’s wheels. The blades could be powered by manual force, with wheels mechanically linked to the cutting blades in order that when the mower is pushed forward, the blades spin, or the device may have a battery-powered or plug-in electric motor. The most typical self-contained power source for lawn mowers is a tiny (typically one cylinder) internal combustion engine. Smaller mowers often lack any kind of propulsion, requiring human capacity to move over a surface; “walk-behind” mowers are self-propelled, requiring a human and then walk behind and guide them. Larger lawn mowers usually are either self-propelled “walk-behind” types, or even more often, are “ride-on” mowers, equipped therefore the operator can ride on the mower and control it. A robotic lawn mower (“lawn-mowing bot”, “mowbot”, etc.) was created to operate either completely alone, or less commonly by an operator by handy remote control.