Electrical synapses:

1) 3.5 nm between presynaptic &postsynaptic cell membranes
2) Gap junction
3) cytoplasmic continuity,
4) synaptic delay virtually absent
5) ionic current flow
6) direction of transmission: usually bidirectional

It is not unique to nerve cells
Other cells also have: heart, smooth muscle, epithelial liver cells
in the brain electrical synapse is less common
electrical synapses do not readily allow inhibitory actions or long-lasting changes in effectiveness.