The D flat augmented seventh chord is a 4-note chord consisting of the notes Db, F, A and C.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Dbmaj7#5.
Interactive piano diagram for the D flat augmented seventh chord
Chords that are a subset of Dbmaj7#5. These contain less notes but all of them are included in Dbmaj7#5.