The Bitmain Antminer Control Board A113D C76C81 (S21 , T21) optimized for air-cooled, this high-quality control board ensures uninterrupted mining, efficient cooling, and comes packaged separately with 7000r support .The control board uses the amlogic A113D main control chip and is equipped with a micro USB data interface.
 
Specifications : The control board is packaged separately. The control board assembly is suitable for 7000r.