BEFOUR SCALES - Accuracy of 0.1 lbs - 500 lb capacity - Push-button calibration - Plug & Weigh interconnect cable - All metal construction - 3 year warranty - Made in U.S.A Specifications Platform Size: 13 x 13 x 2 Weight: 20 Lbs Weight Capacity: 500 Lbs/225 Kg Technology: Advanced Microprocessor Design, Strain Gage with motion detection. Power Source: 120V AC or built in Rechargeable Battery Pack (Included). "ST" platform - The "ST" designates the new "Super Tuff" platform. This design retains the generous 13" x 13" size and features aircraft-grade cast aluminum construction. - Powered by six C-cell Alkaline (flashlight type) batteries that will last up to 3 seasons. They offer the convenience of no outlet or re-charging needed. The 3-segment battery life indicator will provide plenty of warning before you need a new set of batteries, then just go to whatever store you go to buy new batteries. - Console lays flat and has black LCD digits (similar to a calculator). - Many programmable settings such as auto-off, auto-zero, more. - Motion Lock Technology - Accurate weight displays even with unsteady users. -TFPS57 has the 13" x 13" ST platform, total scale weighs 20 lbs.