I have chosen deliberately for a system without a key. The is then usually not there when you need him. It becomes dangerous when one quickly and the house in case of fire. U. have to leave through the locked window or patio door. The argument that the latch at eingeschlagenem window can be easily removed, applies only to a very limited because the only rare and a double-glazed window is not so easy to break. This makes noise and holds on. A system with alarm does not prevent burglary and to two false alarms and / or if neighbors are not there quickly ineffective. The Scheffinger system is as simple as it is ingenious. The assembly is done quickly without having to drill into the window frame which possibly may damage the locking mechanism. It only need three holes to be drilled in the soffit. A strong electric screwdriver it should be. Warning, the screws are countersunk. A sufficiently long bit is advisable to avoid damaging the paint. The processing of each a piece of the task feels grown. The bolt is easily repositioned after use and so can not be lost. I wanted to know like what the small hole in the middle leg serves and had contacted about the HP manufacturer. Within an hour came the recall and all issues were clarified competently. (By the way, the hole for technological reasons - is used to paint.) Strong buy recommendation despite the competing products slightly higher price.
