The key handle allows you to lock the handle so that even if children try to open it, the window will only open in a tilt position.
The Roto child safety lock locks the window sash in the tilt position when the handle is in the horizontal position. The "TiltFirst" hardware is the right solution for safe windows in children's rooms. "TiltFirst" means "tilt first, then turn", as opposed to the classic sequence of tilt-and-turn hardware.
Regardless of whether the Roto child safety window is closed or tilted, only those with the key can open it completely, as the child safety window lock prevents this. This system restricts the window and provides maximum safety in the home when children are alone.