A cryptographic label is provided for enabling a mobile communications device to perform secure communications. The internal volume of the housing can be reached through an opening in a side wall of the housing. In a heat exchanger for cooling humid gas a flowing surrounding heat exchanger tubes 8 of the tube groups 9a and 9b by flowing cooling liquid r in the tubes, the liquid droplets c1 generated by condensation of moisture contained in the humid gas are gathered and sprinkled or fallen in drops on a part of the heat exchanger tube group 9b, which results in increased heat exchange efficiency. The active work server further communicates the work item to an owner associated with the owner identifier. The invention further features compositions comprising insulin analogues and C-peptide and the uses thereof for treating diabetes. The coupling selectively drivingly interconnects one of the side gears and the case.