The DW-56BPB is our brand new model and user friendly shipping scale that is perfect for home or office use. Versatile power options include AC/DC adaptor or 9V battery. * High quality strain gauge load cell system ensures accuracy within full range of capacity. System includes an overload protection device, so your investment is protected. HOLD function makes weighing large boxes easy, even when the weight display is obscured. Easy to read, high contrast and large LCD display ensures weights are read accurately, every time. * This shipping scale comes with a flip-up platform for weighing oversize envelopes easily. USPS freight chart included.