High security with small flaw

As already mentioned, the grid is replaced by other shoppers its function only when it has been clamped into the frame. When a door without problems, but unfortunately associated with a cantilevered staircase with the disadvantage that one side constantly yields and thus a backup function (of three, locking) fails. In my view, the voltage needed just too big. Another problem: the extension parts can not be bought separately.
Therefore, there is one star deduction, otherwise this is but a super protection, I would buy again at any time.

At this point, sorry to the supplier, I have this review by mistake entered in the supplier evaluation.