The Dramm BP-4 is a rechargeable, battery-powered sprayer that fits comfortably on your back. Operating at a maximum pressure of 140 PSI, the BP-4 offers an adjustable pressure knob for flexibility in spraying. Using the high-pressure setting, the BP-4 atomizes spray solutions better than other backpack sprayers, ensuring excellent coverage. The battery-operated pump ensures even flow rates, perfect for even application of greenhouse chemicals. The BP-4 can run for up to 2 hours on a full charge and recharges overnight. Great for spraying nematodes!