I just plug it in and it works. Here's the manufacturer's website: http://www.cnlaunch.com/english/prod...ow.asp?pid=354

Creader IV is the newest portable automotive code reader. Because of it’s small size and portability, it can inform the driver of an electrical fault at any time. After connecting the Creader to the OBD II port, the driver can read and clear trouble codes on the unit. The Creader IV supports OBDII & CANBUS protocols. Features:
• LCD display
• Displays the content of trouble codes
• FREEZE FRAME function
• Supporting CANBUS diagnostics
• Manual for reading codes and clearing codes Specifications:
• LCD display (128*32), displaying by 2 lines, LED backlight
• Two keys operation
• Kit includes a disc including most manufacturer code information. Currently, there are more than 7,000 manufacturer codes, and it updates continuously.
• Includes users’ manual, including the explanation of trouble code before 1,000 number.

Here's the manual: http://usa.cnlaunch.com/products/dow...derIVusers.pdf

The $3000 X-431 Infinite is suppose to be able to modify settings through the OBD-II port. Here's the manual for this model: http://usa.cnlaunch.com/products/dow...31Infinite.pdf