This is a digital guitar effects pedal that lets you switch between 23 different patches (i.e. "pedals"): 7 great built-in ones, and 16 of your choosing. See details at https://mas-effects.com/mimirs-well/
Click here for the bank builder to select 16 patches.
NOTE: appearance may vary slightly from photos (e.g. newer ones have no screen bezel, graphics are UV printed rather than a sticker, and the name of the pedal is no longer printed on it). There have been several generations of this, and you will receive the newest.