Tears of the Kingdom
"A Zonai device that shoots a light beam from its horn, inflicting damage at great range."
Beam Emitter is a type of Zonai Device which shoots a laser from the horn on top of its head. It is styled after a unicorn.
They can be found in Zonai Capsules from Device Dispensers or Treasure Chests; or lying around in the overworld. If removed from a capsule, they cannot be returned to it, although they can be fused to weapons or shields.