It functions identically to its laser repeater counterparts in game as of Alpha 3.20.0 with the only notable differences being that the weapon fires light blue colored projectiles rather than the traditional red and also has unique sound effects. These distinctions are purely cosmetic in the current state of weapons balancing.
Decades of design work went into perfecting the NDB line of neutron repeaters. The S3 NDB-30 rapidly fires powerful and precise neutron projectiles that will quickly deter anyone foolish enough to get too close.
- In-game description 3.10.0