The E flat altered chord is a 4-note chord consisting of the notes Eb, G, Db and Fb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Ebalt7.
Chords that are a superset of Ebalt7. The chords include more notes but always Eb, G, Db and Fb.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Ebalt7 chord. Feel free to save or share the image as needed.