Abstract: The invention relates to a tracking device for managing the rental of a stock of bowling shoes including a stock of shoes for rent and arranged inside a rental space, characterized in that at least one shoe of each pair of shoes is provided with an active RFID chip for transmission to a reception antenna located inside the rental space and connected in such a manner with the reader and the processing computer of the rental space that the presence of pairs of shoes can be monitored in real time when they are not rented out, and in that it further comprises means for deactivating the transmission of the active RFID chips and/or the reception by the antenna when the shoes are rented out in such a manner that the absence of pairs of shoes inside the rental space can be continuously monitored.

Abstract: A method and device for checking a telecommunication system (4) with respect to an accurate routine detection of system-internal call data records (13, 14). Various communications connections are established and later terminated between two subscriber stations (2,3) via the telecommunication system (4) on the basis of predefined communication parameters; further call data records (10a,10b) are independently prepared and saved from these communications connections at both of these subscriber stations (2,3); and the system-internal call data records (101013) for said communications connections that are routinely created by the telecommunications system (4) itself, are compared to the further call data records (10a, 10b).