Abstract: A scanning radio receiver for indicating the presence of operating consumer electronics by detecting the electromagnetic radiation at each scanned frequency is disclosed. The detected field strength at the antenna at each scanned frequency is compared to a first threshold of 20 .mu.v/m from 400 KHz to 88 MHz, 30 .mu.v/m from 88+ MHz to 216 MHz, and 40 .mu.v/m from 216+ MHz to 918 MHz and a first alarm is sounded should the detected field strength exceed this first threshold. The detected field strength at the antenna at each scanned frequency is also compared to a second threshold of 1 mv/m and a second alarm, distinct from the first is sounded should the detected field strength exceed this second threshold. This device is useful for detecting the unauthorized operation of electronic equipment in the vicinity of mission critical or life support electronics which may be susceptible to consumer electronics generated EMI.