Special version on request e.g.: Electrical status monitoring. Function from the inside (with pre-locked bolt): The door has a panic door fitting on the inside. When actuated, the latch and the pre-locked bolt are retracted. The door can be opened. Pulling the door to secures it from the outside (not locked, external lever handle disengaged). Function from the outside (with pre-locked bolt): The door has a lever handle on the outside. When the bolt is locked back twice, it is switched to the "passage" function. The door is always accessible. When the bolt is pre-locked once or twice, it is switched to the "closure" function. The door is only accessible with the key. The door is locked when pre-locked twice. When the bolt is pre-locked once, the door is not yet locked, but only secured by the latch (external lever handle disengaged).