The E flat augmented seventh chord is a 4-note chord consisting of the notes Eb, G, B and D.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Ebmaj7#5.
Interactive piano diagram for the E flat augmented seventh chord
Chords that are a subset of Ebmaj7#5. These contain less notes but all of them are included in Ebmaj7#5.