Root on A string
x7879x
E7♭5 is the E dominant 7 flat 5 chord. Its notes are E, G♯, B♭ and D. A four-note altered dominant. Mute both outer strings.
x7879x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every E, G♯, B♭ and D on the first 12 frets. The filled dots are the root, E. Build your own shape from any nearby group.
Other E chords
Other dominant 7 flat 5 chords