A Variety of Connection Options for Affordable Printing. The Zebra S4M is designed for budget-minded users who need maximum production.The S4M features both 203 and 300 dpi print resolutions, multiple interface options (including serial, parallel, USB, Ethernet and 802.11b wireless connections). The side-loading design makes adding labels and ribbon fast and easy, and a full 8" label roll capacity means refills are needed less often. The S4M uses a durable metal case, making it ideal for warehouses, shipping and receiving facilities and other locations requiring durable construction. For both thermal transfer and direct thermal printing at a cost-effective price, the Zebra S4M is the ideal choice.