M5 Scale, 5lb Digital Postal Scale, USB connectivity. With the DYMO M5 Postal Scale you an weigh envelopes and packages up to 5 lbs (2. 2 kg) - without a trip to the Post Office or mailroom. Conveniences include a "hold" feature that locks weight display for 10 seconds when the screen is obscured by a larger item, a tare function for accurately weighing items in a container and an automatic shut-off that prolongs battery life. Compact size fits on any desk and stores in most desk drawers. Runs on 3 AAA batteries (included).