Spray Anywhere, Anytime. Go where other sprayers can't!! Great for house, fence, deck, and project painting. Backpack acts as material container for maximum mobility. Optimius dual fan pattern tip delivers a professional spray pattern. Batter charge indicator on sprayer head. One hour battery charger. 2 18-volt batteries included. Remote suction set to draw material directly from can or backpack for big jobs. Cylinder material: Tungsten carbide. Piston Material: Tungsten carbide.