Detecto's model 8435 with its heavy-duty steel base and under-structure, an easy-to-clean, roomy 22 x 14.7 inch (56 x 37 cm) polystyrene trays cradles babies securely on this sturdy scale. The filtering feature compensates for typical baby movement and the Lock key holds weight. Powered by 6 AA batteries (not included) or optional AC adapter. EMR/EHR ready. 130 lb x 0.1 lb / 59 kg x 0.05 kg capacity