A Taser is an electroshock weapon that uses electrical current to disrupt voluntary control of muscles. Its manufacturer, Taser International, calls the effects "neuromuscular incapacitation" and the devices' mechanism "Electro-Muscular Disruption (EMD) technology". Someone struck by a Taser experiences stimulation of his or her sensory nerves and motor nerves, resulting in strong involuntary muscle contractions. Tasers do not rely only on pain compliance, except when used in Drive Stun mode, and are thus preferred by some law enforcement over non-Taser stun guns and other electronic control weapons. At the present time, there are two main police models, the M26 and X26. Both come with various accessories, including a laser sight and optional mounted digital video camera that can record in low-light situations. Taser International is also marketing a civilian model called the C2. On 27 July 2009, Taser introduced the X3, capable of firing three times without reload. Tasers were introduced as non-lethal weapons to be used by police to subdue fleeing, belligerent, or potentially dangerous subjects, often when what they consider to be a more lethal weapon (such as a firearm) would have otherwise been used. The use of Tasers has become controversial following instances of Taser use that have resulted in serious injury and death,[8][9] and while they are far less lethal than many other weapons, the U.N. are concerned that use of Tasers may amount to torture, and Amnesty International has reported cases where they believe that their use amounted to "cruel, inhuman or degrading treatment which is absolutely prohibited under international law".[10]