To put it simply a freeze ray.
Type 1 Edit
The more common type, this tech uses a low temperature compound and pressurized gas to expel a stream of the cold material onto a target. This device is the most complicated as it require acute timing in the fans and expulsion system as well
This device is instead an EM that displaces the kinetic molecular energy of the target.
Type one is almost always a gun of sorts while type two usually bears an antennae dish to emit their EM rays.