You'll never make a mistake or overpay for postage again with ONYX Products® 5 lb. Digital Postal Scale. Simply place your letter or package on the platform and the weight is automatically transferred to your postage software. Precise 0.1 ounce accuracy for 1 ounce letters or 5 pound packages Automatically sends weight to multiple postage platforms Large back-lit LCD screen with an improved viewing angle Compact size fits on any desk and stores in most desk drawers Integrates directly with a PC or Mac via included USB cable Specifications Capacity: 5 lbs. Resolution: 0.1 oz. Accuracy: 0.1 oz. Power Supply: USB port (cable included) LCD Dimensions: 2 5/16" x 7/8" Scale Dimensions: 7 13/16" (wide) x 15/16" (high) x 7 13/16" (deep) Operating System: Windows XP/Vista/7 and Mac OS X 10.5 or higher 1 year replacement or repair for all manufacturer defects Package Includes: ONYX Products® 5 lb. Digital Postal Scale, USB Cable, and User Guide The ONYX Products® 5 lb. Digital Postal Scale is compatible with: Stamps.com Software Stamps.com Online Endicia Online ShipStation