The Boss ME-50 is a fantastic all-in-one guitar multi-effects floor unit.   Described by Boss as like having an entire collection of Boss pedals at your feet, the ME-50 boasts 10 EQ pre-sets, 22 types of distortion, 11 types of modulation, 11 delays, and 6 expression pedal effects like wah and ring mod. The controls are intuitive for any Boss user, using knobs like the ones you'd find on typical Boss stompboxes.   This comes with a Boss Power unit (PSA-240) and the original instruction booklet.
 
The effects unit is fully functional and is good condition.