The Sherpa deluxe multi sprayer is a dual function, powered sprayer. It can be used either in wheeled mode, as shown here, or in backpack/knapsack mode. The unit has a rechargeable battery built in. Simply fill the tank up and switch on, and you are ready to spray with no effort required! Pull or push the wheeled trolley and spray at the same time. The unit is easily removed from the wheels without tools and comes complete with the straps required to wear the sprayer as a backpack. No pumping required. The battery will pump continuously for up to 7 hours on a single charge. The fantastic new Cordless Electric Knapsack sprayer with wheeled trailer. This lightweight versatile sprayer offers the convenience of a go anywhere Knapsack sprayer without the need for constant pumping. Supplied with strong padded shoulder harness and ergonomic tank engineered to match the body's contours making it comfortable to ware for long periods of spraying. The trigger has a locking function for constant spraying to reduce hand fatigue. Simple easy control of pump pressure can be set to your desired requirements by a rotary knob, High settings are great for a dense spray to cover large areas while low pressures are ideal to obtain a light mist for delicate work. The Sprayer is supplied with an automatic battery charger and fitted with a Battery volt meter and Battery low warning alarm. It also include a unique detachable wheeled trailer with telescopic towing handle, this is ideal if your unable or prefer not to carry the weight of a sprayer on your back, its extremely well balanced and easy to wheel around your garden. The trailer has a storage compartment to neatly store the shoulder straps and spare nozzles.