The E flat suspended fourth chord is a 3-note chord consisting of the notes Eb, Ab and Bb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Ebsus4.
Chords that are a superset of Ebsus4. The chords include more notes but always Eb, Ab and Bb.
Chords that are a subset of Ebsus4. These contain less notes but all of them are included in Ebsus4.
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 Ebsus4 chord. Feel free to save or share the image as needed.