I lost 2 of these units to another company not long ago. my last visit I plugged my map unit in, entered the code and left. 5 months later we got a call to that building because both elevators were down and the other company couldn't get them going (no map unit) we walked up and plugged the map in and away they went. my calculation would have been between 80000 and 100000 runs between code entries.
