Dustproof Switch Design: The dustproof sealed switch of the electric sander is improved to prevent dust from entering and prolong the life of the switch.Variable Speed Control: Equipped with 3-speed variation, the speed of this random orbital sander can be adjusted from 0 to 3000RPM to suit different applications and materials.No Electricity & No Record: This cordless orbital sander is equipped with 21V voltage. Cordless design is not limited by the use distance, which makes your operation more convenient and comfortable.Efficient Dust Extraction: The cordless wood random orbital sander has a built-in dust extraction system that draws dust directly into the dust collection box that comes with the tool. Easy to install and remove, keep the machine clean.Ergonomic Design: soft rubber handle with ergonomic design, comfortable and firm grip, suitable for one-handed work. This sander is the ideal sanding and polishing machine for wood, furniture, etc.