Our line of USB to RS-232 Serial Adapters offer several unique features that make them particularly convenient and easy to use. They provide up to 16 ports via a single box with easily accessible connections. They are all bus-powered, so no external power supply is needed--an unusual feature in adapters providing such a large number of ports. They also feature the industry's only surge suppression package for USB that makes them ideal for implementing USB to serial networks in laboratories, factories, and other potentially harsh environments.