The Sonic Stun Weapon, also called the "stunner", is a hand-held weapon designed by Henry Foss. It uses sonic sound waves to temporarily stun the victim. Stunners have also been used as offensive weapons on several occasions, for example when Helen Magnus is forced to shoot a mercenary who was attempting to capture an abnormal. Stunner batteries are removable, as shown by Henry using the stunner battery in order to power the emergency lighting in a destroyed Cabal bunker. They also appear to have ajustable power settings as shown during Typhuss James Halliwell's rescue from a group of abnormals; the shot from the stunner suddenly changes from blue to orange, and is capable of bringing down a rock ceiling.
It is unknown wether Henry put this in intentionally. By 2386 the mark II sonic stun weapon was designed by Henry Foss. Later Helen Magnus and Henry Foss used the mark II sonic stun weapon after tracking an Abnormal fugitive, and discovers a secret research lab for a Homeland Security agency that conducts tests on Abnormals.
Later that year the Sanctuary team used the mark II sonic stun weapon against a humanoid abnormal with a naturally armored body in the Sanctuary, it had no effect on the abnormal until Helen used a super sonic stun weapon.