Easy and economical solution

The Reer 70010 Window and balcony door locking, we have attached our daughter on the balcony door, as it has often locked the little fun. There is a handle as the window and can be easily operated. After a short time he also opened again and again, but it could also sometimes be a pot on the stove and boil over or otherwise be an emergency, so there is a balcony door locking advantageous.
The instructions are very easy to understand and has sketches for assembly. But it's so simple, it saw again and assembly works.
It's very easy: rotate the cover, loosen the screws, pull out handle. Door security including and grip screw again, ready. To open pressing the side latches and move at the same time to handle. The backup automatically locked then the handle.
In our neighboring community is sometimes a woman plunged from the balcony and has seriously injured when she tried to climb down because she was locked out.
This is a cheap and easy solution, I can only recommend!