CableMax RS-232 LED link Tester DB-9 Male to DB-9 Female RS-232 DB-9 / DB25 Pin assignment No Power required Standard RS-232 DTE & DCE Interface Offers DB-9 Female & DB-9 Male Connectors Easy to install , Plug & Play OS Compatibility: Windows 98, Me, XP, 2000, 2003, CE, Vista, Windows 7, and Windows 8 as well as Linux and Mac OS 10.X