Factual error: They repeatedly say how equipment will freeze in moments, but they leave their faces exposed and coats open, hoods off at times. In such cold temps, the skin would freeze in minutes.
Revealing mistake: When Ralph is talking to the Special Forces Unit, the spectrogram at the bottom of the screen does not match the voices from any characters or the gunshots.
Answer: They are a real device. You can find more information online. Just google "stun-cuff."
raywest