DYMO Stamps Internet Postage Labels make printing USPS approved stamps possible- right from your home or office. DYMO Stamps is the fast and easy way to print the new "shape-based" USPS-approved postage - from PC or Mac. It eliminates the need for costly postal meters, or to stand in line at the post office to purchase stamps. The DYMO Stamps software and service works with DYMO's high performance LabelWriter 400 Turbo, Twin Turbo and Duo label printers. Instructions to install the free software and sign on to the no-monthly-fee service come in every box. In minutes you'll be printing postage - for First Class, Priority Mail (1 lb. envelope, flat rate envelope and flat rate box), Express Mail flat rate envelope, International Mail (1 oz.) and postcards. (Note - If you already have a LabelWriter 400 Turbo, Twin Turbo or Duo printer