With ProPack SRS-540, polyethylene tank hold 4 gals. of lawn-care chemicals. Runs on 12-v. rechargeable battery, which provides enough power to spray up to 120 gals. on a single charge. Status lamp indicates when power is on and blinks when battery runs low. Charge battery pack on-site, or remove pack for remote charging. Built-in microprocessor offers 1-touch master control that ends need for tedious, manual pumping. By pushing a button, operator can select 1 of 4 pumping speeds, ranging from a delicate mist to high-volume spray or long-range stream. Just depress hand lever to initiate spraying, then release lever to stop operation. Lever also locks in open position to reduce operator fatigue during large spraying jobs. A 24-in.-long lance assures accurate spraying in difficult-to-reach areas. For user comfort, features include breathable back pad, stabilizing waist belt, and padded, adjustable shoulder straps. Chemical-resistant pump rests in polypropylene body. Spray hose consists of braided PVC.