point in another iteration the device 12 might be configured to conserve on board power by not transmitting its one or more frequencies until an activating signal is received in such as embodiment an activating signal would be provided from elsewhere and if the selected condition occurred such as water breakthrough the shield would become compromised and the existing signal would reach the device 12 thereby triggering its one of more frequencies such that a signal indicative of whatever the shield is configured to react to has occurred due to the potential number of frequencies and arrangements downhole the frequency received by a sensor will tell an operator where the selected condition occurred in yet another iteration the device 12 may be configured to receive one or more frequencies and send another one or more frequencies for various communication requirements it is to be understood that the one or more frequencies broadcast by the device 12 may be used for for example simple communication of the occurrence of a selected condition downhole or as a triggering signal for another device to actuate for example the frequency might be used to actuate an e trigger that then causes a sleeve to close due to water breakthrough at that location in another iteration the device 12 may be configured as a sensor with a timer that auto.