The B suspended fourth seventh chord is a 4-note chord consisting of the notes B, E, F# and A.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as B7sus4.
Chords that are a superset of B7sus4. The chords include more notes but always B, E, F# and A.
Chords that are a subset of B7sus4. These contain less notes but all of them are included in B7sus4.
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 B7sus4 chord. Feel free to save or share the image as needed.