* Under normal status, it is available for selecting electronic or mechanical combination number code.
* This type lock shipped with buzzer, during opening lock 3 times with wrong number, the electronic combination locks lost its function and buzzer alarms continuously for 30 minutes at the same time.
It is necessary to release this problem and to open locks by mechanical combination number code only.
* In order to perform more stronger function of this locks further, the locks combined with key locks as well which can locking mechanical ＆ electronic combination locks or to lock mechanical combination locks singly.
* When electronic combination locks was broken, it still can be opened by mechanical combination locks and without worry of effecting customer's daily operation due to combination locks was broken. For maintenance required, it also no need to break the locks structure and to maintain the locks with most simple way.