This is a guitar loop pedal that records short passages played on an instrument and plays them back in a repeating loop.
And it is analog! The signal-to-noise ratio is not that good, but the sound is thicker than any digital alternative can provide.
The only pedal on market that uses similar technology is Zvex Lo-Fi Loop Junky.
These are diy projects our looper is based upon: Madbean Loophole and Dean Hazelwnter's Mobius Trip Looper.
The circuit is based on ISD1020 chip.
The supplier for these analog recording chips is a company called Nuvoton. According to their datasheets, the chips use some kind of patented flash memory that can store sound without digital conversion.