The solo 417-li electric 11v battery-powered backpack sprayer is powered by a strong 11v lithium-ion battery that can recharge in less than 3 hours. The backpack sprayer requires no pumping and produces no emissions, perfect for a variety of spraying tasks. Two-stage toggle switch on the 11v pump allows for adjusting pressure from 36-62 psi.Smooth, padded backpack frame and shoulder straps for a comfortable fit on the user's back. Polyethylene tank capacity: 4.5 us gallons (17 l). Powered by a rechargeable 11v lithium-ion battery (recharges in less than 3 hours). Battery charger and flat spray nozzle included.