This is a cool idea, and as per usual with Boss, it's well-executed. There's 100+ effects built-in, so you can build yourself patches running up to six of the internal effetcs at once. Then, there's three separate send and return loops, so you can add in all your favourite pedals with ease. Then, you can setup patches with both... dang, you're gonna be such a smooth operator. This one doesn't include box or power supply, but it runs on a standard 9v supply.

Model: Boss MS-3 Multi Effects Switcher 
Made: 2017, Taiwan
Serial: Z8H2848
Type: guitar multiple effects processor/switching
Power Input: standard 9v DC centre-negative (supply not included)
Accessories:: no box/docs/leads

Condition notes: Used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)