Based on the record system 20, the record STA 21 has been modified to meet the requirements of light to medium-heavy door applications.​

Both have the same system, enabling the interactive exchange of information between control, sensors and electronic remote-control unit.

The majority of the record STA 21 components are shared with the system 20, which has a proven track record in global markets, but fitted with smaller, lighter electrical motors and a specially modified PLC.