This design is very interesting. The PKI 2160 digital Transmitter Recorder is coupled to a transmitter. With a receiver, it will wirelessly receive data up to 300m, i.e. during monitoring, direct listening-in over a larger distance is feasible and recording is simultaneously realized by the PKI 2160 digital Transmitter Recorder. This is particularly important if the sources of interference impede the wireless transmission or the monitoring operation has to be realized for a longer period. When connecting the transmitter, the monitoring time changes to 7 hours. Larger runtimes can be delivered on request.