Improved daisy chain design to connect 2 clusters of fans. LIAN LI SL120 V2 fan frame thickness is 28mm to provide 10% improved airflow compared to V1. Removable interlocking keys to provide better radiator clearance. Start/stop fan RPM support for a quieter environment. Smoother side lighting for a better aesthetic. Only one cable is required for each fan cluster when using the provided new UNI HUB to control lighting effects via L-Connect 3.