Features VARIOUS CONNECTORS Designed for 5V, 3.3V, TXD, RXD and GND connectors to meet your different work requirements, reliable and useful. Better Design The 340 chip has wide compatibility, while the yellow pin header ensures easy installation and good durability. Wide matching: support for WIN98, for ME, for 2000, for XP, for Server 2003, for VISTA, for Server 2008, for Win7, etc. Has Long Line A 50cm cable is also connected to the USB to TTL serial adapter module, which allows for a tighter connection. Work light: With PWR, TXD and RXD indicators, as well as reserved RTS and CTS positions for convenient operation. Specification: Item Type:USB to TTL Serial Adapter Cable length: approx. 50 cm / 19.69 inches. Function: USB to TTL Transmission speed: 300 bps to 1.5 Mbps Connector: 5V 3.3V TXD RXD GND Package list: 1 x USB to TTL Serial Adapter Small note: The industrial control board has a TTL port, which can use a USB to TTL communication cable. Some systems are not compatible. You can use a USB to 232+232 to TTL communication cable. Package List 1 x USB to TTL Serial Adapter