This is a handmade synthesizer based on the stepped-tone generator also known as the Atari Punk Console. What makes it different is the built-in sweeping LFO that gives it an almost automated effect.
You have controls for frequency, pulse length, and LFO speed. The case is an old repurposed wooden box and some salvaged parts were used.
It has a 1/4″ output jack and is powered by wall adapter.