Great device. Small, with antenna, digital and analog output. I checked with a lighter - buzzer and bright white LED, digital output for alarm, works. Delivery up to 7 business days from the Netherlands to Poland
By varying the length of antenna wire it's possible to adjust the sensitivity. I like having it in the house to listen for the odd EMP switching spikes. Eg, washing machine change of cycle, fridge cycle, lights etc. Also hears lightning and sometimes other switching events from nearby in the neighbourhood. Remarkable device, found some dangerously noisey products in the house too. Has run for over 2 months so far on 3xAA's.