The smooth lines of the molded poly enclosure, lift-off stainless steel commodity tray, and sealed membrane keypad make cleaning the PS-4 easy. The commodity tray utilizes welded studs on the bottom of the tray that fit tightly into the weighbridge of the scale. The main board on each unit has a moisture resistant coating, adding additional protection from the elements of everyday use in the food industry. Comes with retail packaging in both English and Spanish. The PS-4 can be operated on battery or AC power.