This electronic chair scale was designed for weighing those who have difficulty standing on their own. The scale provides accurate weight with easy to read LCD display with white LED backlight. Features include unit, tare, zero, function, BMI, hold and on/off. The chair is ergonomically optimized for comfort and safety with footrests the lift away for easy access. The rear wheels lock for safety and the front wheels swivel for easy portability with easy to clean plastic seat. Operates on internal battery and US AC adapter (included).