This is TRANE X13650868-03 American Standard 6400-1083 Rev C Control Circuit Board 6200-0124-02 used part. 

This part was removed and inspected by professional installer from a fully functioning system. Was in great working condition when removed.

In very good cosmetic condition as well.  Please see more details from the images attached. 

FREE USPS standard mail delivery guaranteed.

My handling time is 1 business day only.

Purchasing used parts you agree with the statement that sometimes hidden defects or malfunctions may occur during installation or continuous use. There is no warranty on used parts. 

 But you have 30 days satisfaction guarantee and 30 days FREE returns!

 Most of the parts require specific knowledge and skills to be installed properly. If you don’t have skills or knowledge, you must ask certified HVAC technician to install. I am not liable for any damages or failures as a result of improper installation.