The present invention provides a device for transitioning between a first floor covering and a second floor covering wherein the transition device includes an elongated core and a covering. Various embodiments are provided that are suitable for mobile radiotelephone devices of the third generation and, in particular, for transmission systems according to the UMTS standard upon involvement of a multi-band GSM system. Note that a reference potential is supplied to the first photodiode so that an open circuit voltage is outputted, and a potential is supplied to the second photodiode so that a forward bias is applied to the second photodiode. 1 and 10 g10min at a temperature of 230\xb0 C.