There are a number of guitar pedals that purport to "re=create" the sound of AM radio. They're mostly notch filters that take out the low end the the dial varies the side the depth of the roll off. Some models as a second control may allow you to add fuzz to mimic the static. Popular brands include Havana Radio, and Penny Pedals.
But this guitar pedal receives actual AM radio. The station sounds like 570 KLAC-AM.
The phenomena is well documented.