Light on your back: Empty weight only 9.5 lb (full weight depends on tank fill level, up to 42.5 lb). Back and shoulder straps are foam-padded for comfort. Rechargeable Li-Ion Battery included: 96Wh (8 Ah) rechargeable battery lasts up to 5 hours of spraying (pumps up to 55 gal per charge). No hand-pumping, no propane, no gasoline, no extension cords. Adapts to you: 24-inch poly wand extends to 35 inches. Includes cone-spray and fan-spray nozzle. Press the trigger to spray, or click the continuous-spray lock to rest your fingers. Motor speed knob can be adjusted while spraying. Solution tank: 4-gallon poly chemical-resistant tank. Translucent so you can see tank level. Easy-fill 6-inch wide opening (accessories packed inside). 9 month limited manufacturer's warranty. U.S.-based technical support. Replacement parts available. The MistGen Lightweight Li-Ion Backpack is one of the lightest 4 gallon backpack sprayers, weighing only 9.5 lb empty, thanks to the integrated Li-Ion battery.