RS-232 Serial Auto Switch (2 to 1) AS-251S allows 2 PCs to share 1 serial (RS232) printer. It is easy to install and needs no additional power supply. Features No External Power required. Output Port Selectable. Tran sparent to the user. FCC Approved. OS Compatibility: WIN98?WIN ME?WIN 2K and WIN XP. Package Content 1x AS-251S Serial Auto Switch 1x User Manual Specification Connectors Input (DCE) 2 x RS-232 DB-25 Female Output (DTE) 1 x RS-232 DB-25 Male LEDs Input 2 Port Selection Input Auto / Manual Input Arbitration First come first served Function Key Manual / Select Timeout Selection 10 ~ 60 seconds Power Consumption AC 9V 100mA (max.) Cable Length 15 m [50'] (max.) Housing Plastic Weight 0.l25kg Dimensions ( L x W x H ) 10.2 x 8.5 x 2.6 cm