Tripp Lite's 4-Port Manual Data Switch is the economical solution for connecting up to four computers to one parallel/serial device such as a printer or up to four parallel/serial devices to one computer. The switch saves significant hardware costs by enabling printer or peripheral sharing. The 4-Port Manual Data Switch supports parallel or serial devices and features straight-through connection on all 25 lines. The 4-Port Manual Data Switch features a fully-shielded rugged metal case with a front-panel switch. It does not require any AC power to operate. Tripp Lite warrants this product to be free from defects in materials and workmanship for life.