Electro-Harmonix Steel Leather (Bass expander)
The Steel Leather is the first dedicated expander designed for bass guitar. It lets you cut through any live performance with presentation definition. An expander is the reverse of a compressor, and the enhanced attack, will ensure that your bass does not get lost in performance.
You'll find everything you need to know here.
State of the pedal is as good as new, and it is delivered as is, without instruction manual (available on the above mentionned link), original packaging, nor power supply.