Proback 12v Diaphragm Pump Battery Powered Backpack Agricultural Sprayer 4 Gallon Five Speed Water Flow Water Tank Capacity: 16L 4 gallon Battery: 12V 8A; Battery Charger: 12V 1A Diaphragm Pump: 12V 3.1L 0.8GPM 70PSI. Applicable for agricultural use. Accessories: 31.5 inch plastic steel lance, 1M hose, plastic conical single nozzle & double nozzle Five speed water flow adjustable. More choices of spraying rate, users can adjust the flow rate by five shifts from low to high according to their spraying situation.