Designed to lift open bottom skids, boxes and baskets. Two operations available: hand pump and 12V DC power with rocker switch to raise or lower. Hand pump design features an ergonomic pump handle with two lifting speeds to accommodate for light or heavy loads. Side stabilizers lock lift in place when load is raised above 20-1/2". Suffix "SS" stands for stainless steel units. An on board battery charger and battery chargfe indicator gauge comes standard with DC models.