Purchased this item used. The "ECM-3" is an extension cable specifically for ZOOM's optional microphone capsules. It allows you to position the microphone capsule up to 3 meters away from the recorder body. It can be attached to commercially available tripod stands and action camera mounts. - Model Name: ECM-3 - Brand: ZOOM - Included Accessories: Manual, Cable There are no performance issues, but there is some peeling on the corners. Will offer a discount if purchased as a set with the Zoom H5, which I am also selling separately. Thank you.