Comtrol Corp. - RocketPort USB Serial Hub II 4-Port RoHS Type: USB/Serial Ports: 4 x Serial Transfer Rate: 300 to 230.4Kbps Dimensions: 7.5" x 0.88" x 3.0" Weight: 8.7 oz. Temperature: 0 to 50° C Humidity: 5% to 95% Features: The RocketPort USB Serial Hub II is a USB-attached 4-port serial expansion device for PC-based servers and client computers.Delivering four RS-232 ports, the RocketPort USB ...