1,Scope of Application: Battery adapter is compatible with most styles of 18V to 21V, suitable for woodworking, power tool adapters. 2,Multiple Protection Functions: There are short circuit protection, over current protection, under voltage protection and low power consumption. 3,Premium Material: 18V to 20V battery converter is made of ABS, fine workmanship makes the products durable, not easy to damage. 4,Closely Fitting: Closely fit the original machine hole position with accurate shape and size design, hand feelings are still comfortable. 5,Good Workmanship: Exquisite workmanship, beautiful appearance design, small portable size, providing you great using experience. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.