This sprayer is most popular model, tank is hdpe plastic and good welding, and fiber glass lance which is strong, rubber seals is anti-crossive, the pressure is good only after few pumping. With strong strap belts Product name:knapsack electric sprayer Model number:hm-16a (switch type) Pump:dc12v/2a (small pump) Working pressure:0.2-.04mpa Dimensions:390mmx180mmx515mm Battery:12v /9ah Charger:dc12v/1.0a (smart charger) Volume:16l Weight:5.1 kg Control:mian switch + handle button control