Available in single and double chain variations, the chain is designed to engage with pinions that mounted on a drive shaft that is inside an external casing. As the pinions spin, the chains links rotate through the casing at a 90-degree angle which directs the chain into a rigid, straight form, highly resistant to compression and tension.

As the chain is directed into a straight form, the window pushes open and as it retracts into the casing, it causes the window to close.