EHX Intelligent Harmony Machine.
This pedal is cosmetically in great (excellent) condition. It works well and sounds good. Writing on the casing is small because of the EHX graphics (way to busy in my opinion), so unless you use it all the time and are super familiar with it it's hard to make adjustments such as Key being played and interval desired. It does have a polyphonic override that works very well. EHX, like or dislike, has gotten this pitch shifting and harmony effect down pretty well. Some of the preset intervals are not super useable for how and what I play, but many of them are spot on- I.e octaves, 4ths, 5ths, major / minor thirds etc.
The effect can be used a couple different ways- select the key, select minor or major, and select the desired interval(s). Alternatively you can use it in polyphonic override and select the desired interval. Switch can be momentary or latching. Has dry through connection capability.
Comes with manual, power supply wart, and original box.