The presented solution enables placement of mobile device advantageously formed by central control unit (9z) or mobile phone in removable condition, in holder (805) placed on bracelet (806), on wrist (836). Device can be formed, with the advantage, by mobile phone which is possible to remove out of holder (805), for to make call, by loosening bolts (812), pressing buttons (808) and put earphone to ear. The device is possible to be shifted to other holders (805), placed on various places or objects.