It is connected by strong bolts to the window frame and the window sash and rotates with the complete opening of the window. If you want to open the window "on tilt", the locking steel pin by means of pressure needs to be unlatched. This works very simply and the state ("on" / "closed") is visually by the red color of the pen tip easy to recognize - a key is not needed.
The installation check the enclosed assembly instructions for DIY amateur relatively easy to accomplish. Are only needed (Battery) drill, marker and screwdriver (possibly. Still tape measure / ruler), all other necessary parts are included. When you first shoring is needed 15 - 20 minutes; you already have a bit of practice, one comes also in 10 minutes to your destination. The slim design only relatively little space between window casement and reveal is required.
According to the manufacturer, the pressure resistance is more than 1 tonne, thus preventing effectively the levering of the window. The castle is VdS approved and DIN-tested, so that just in case the insurance company has less chance to dodge a regulation.
The price is certainly not cheap, but reasonable for the quality - and the (at least perceived) security growth is already unaffordable. A strong buy recommendation!