1、Various Ports: Designed to have 5V, 3V, TXD, RXD and GND ports to satisfy your varied working needs, reliable and useful. 2、Wide Matching: Supports for WINDOWS 98, for ME, for 2000, for XP, for Server 2003, for VISTA, for Server2008, for Win7, etc. 3、Has Long Line: A 50cm long cable is also attached to the USB to TTL serial adapter module, which enables firmer connection. 4、Better Design: 340 chip has wide compatibility, while the yellow pin header ensures easy installation and good durability. 5、Working Light: Comes with PWR, TXD and RXD indicators as well as reserved RTS and CTS positions for convenient operation. 1 x USB to TTL Serial Adapter Item Type: USB to TTL Serial AdapterLine Length: Approx. 50cm / 19.69inFunction: USB to TTLTransfer Speed: 300 bps to 1.5 MbpsPort: 5V, 3.3V, TXD, RXD, GND