The Auto-Zero Weight Module, model SR801, is a transfer lift scale attachment designed for use by individuals with mobility disabilities or spinal cord injury. This self-contained, portable weight module converts Hoyer lift models C-HLA, P-HLA, E-C-HLA, P-C-HLA, and C-HLA-RB, or Invacare lift models from the 9800 and 9900 Series into a digital scale system. The scale has a five-digit liquid crystal display (LCD) that shows weight in either pounds or kilograms. POWER: Uses one 9-volt battery. DIMENSIONS: The case is 1.75 x 3 x 3 inches and the overall height is 5.5 inches. CAPACITY: 400 pounds. WARRANTY: Two-year limited warranty.