Self contained single motor assembly reduses noise. Motor assembly can be easily installed and removed without tools. Weighs only 149 lbs. Foot section is half the weight of conventional semi-electric foot sections. Easily assembled with only 5 components. 9 volt battery backup. Heavy Duty 31/2 inch locking caster provides easy maneuverability and security. The head and foot boards can be raised or lowered simultaneously or independently. Lifetime Warranty on frame and welds. Two Year Warranty on electronics and all moving parts.