Abstract: A compact communication apparatus comprises: a processor module (104); a memory module (106); a wireless communication interface (108) and a mobile power source (114); wherein: the wireless communication interface (108) comprises short-range wireless communication module (110) and a physical alignment device (112), said physical alignment device (112) usable for aligning the compact communication apparatus with another compact communication apparatus containing a similar wireless communication interface (108) such that data communication can happen between the wireless communication modules (110); wherein the processor module (104) is adapted to act on the data received from the wireless communication module (110) and to store some related data, especially variables, to the memory module (106); wherein the mobile power source (114) is contained within the compact communication apparatus and provides the power to run at least said apparatus wireless communication interface (108) and processor module (104); whe