The Dramm BP-4 Backpack Sprayer is a rechargeable, battery powered, high-pressure sprayer that fits comfortably on your back. Operating at a maximum of 150 psi, the BP-4 atomizes spray solutions for excellent coverage. The battery operated pump ensures even flow rates. The 4 gallon capacity is just the right size. Perfect for spot treatments or concentrated applications, but small enough to still be comfortable. Package includes a quick change battery and a quick charger. Operating time on one battery is 45 min.