The electric version provides unlimited power available on demand for use at workbenches and tool rooms. The adaptor converts 120VAC to 24VDC to provide the needed energy for this powerful tool. No more wondering whether the tool is ready for use. No more worrying whether the battery packs are charged up or how much of a charge is left on them. Strokes per minute have been increase to 2700 no-load and approximately 2500 strokes per minute under-load. It is nearly impossible to slow down the power this unit puts out. It’s ergonomic, compact size, with a diameter (hand area) of 2", fits easily into either a man or women’s hand with complete comfort. Overall length of tool is just 10.25" long. Even lighter weight. Since there is no battery pack to insert in the tool the weight of this unit is just 18 ounces. This makes it easier for the hobbyist and craftsperson to sand, shape, cut, file and finish projects longer.