The Delta DM-1200 measures 2 1/8 inches by 1 inch by 3 1/4 inches. It transmits at 300 or 1200 bps and has all the functions of a full-size modem. It runs on a 9-volt battery, AC power or with a lighter adapter in your car. It works from a PC's RS-232C slot. DB-25 female connector for computer with an RJ11 phone line port on the other end. Adapter not included. Battery shown not included. This item is currently Untested and Sold-as-is.