The Zoom Modem V.90 External is a high performance 56K fax modem that plugs into the serial port of a computer. It also works with any device that can provide RS-232 signaling for transmit, receive, ground. It is ideal for use with point-of-sale devices and dumb terminals which do not provide DTE signaling. Robust power handling features including protection against brownouts and power glitches make this modem suitable for unattended remote applications. Zoom H08-03328 Data Modem is one of many Analog Modems available through Office Depot. Made by Zoom.