... for RS-232connections using USB. It provides an external plug-and-play port for convenientconnection of cell phones, ... volume, easy installation 2, No power supply needed, plug and play 3, Automatic detective serial signal rate Standard ... protection Interface type USB side type A interrface female, RS-232 side DB-9 male Working temperaature - ... Date:2012-04-24 04:58:31 USB to RS232 Serial DB9 Adapter Converter