You're looking at a mint condition JHS Pedals Firefly Fuzz. This is serial number 528 built on 3/25/2015.
This is a very rare and obviously discontinued Tone Bender style fuzz from what some may call the Golden Years of JHS Pedals. If you've wanted an awesome style TB Style fuzz, this is the one to grab. Surely to go up in value over the years.
* Box and case candy not included