How can electromagnetic waves be detected in the home? Which devices generate alternating electromagnetic fields even when on standby? This kit for an electrosmog detector can be used to detect alternating electric and magnetic fields in the frequency range 50 Hz to over 1000 MHz. In this way, energy guzzlers can be caught "in the act". If you wish, you can use the electrosmog detector to reduce EM fields in relaxation rooms, bedrooms or children's rooms. The circuit board is already assembled. Tinkerers only need to solder on the loudspeaker, the LEDs, the setting controller and the antennas. You also need a 9 V battery and you're ready to go.