Balance is powered by two AAA batteries. For use with Hoyer Lift General Patient Scales - does not include Patient Lift or Sling. This item includes a precision LCD scale, four climbing buckles, a sling and a boom. (Easy to attach: fits any Hoyer lift pole lift, etc.). There is no need to disassemble the Patient Lift, installation is simple and the process is quick. Ideal for use in any home care setting, even institutional care. Ideal for weighing bedridden or chronically bedridden patients at home. The backlit LCD display on the scale is easy to read in all lighting conditions.