Detecto’s made-in-USA in-bed scales features flame-retardant, antibacterial 6 ft (1.8 m) long stretchers which are positioned underneath the patient and hydraulically lifted inches from bed for weighing. They feature adjustable weighing arm, locking casters and American-made steel structure. The ZERO key allows staff to easily deduct the weight of bedding for precise patient measurement. Six AA alkaline batteries (not included) or optional AC adapter Not for transport EMR/EHR ready Sturdy Steel Construction Fits Through 36 in/91 cm Doorways 500 lb x 0.1 lb / 225 kg x 0.1 kg capacity .75-in-high LCD Made in USA Quality Hydraulic Lift Mechanism