Stun gun

The Buzzkill TND (Threat Negation Device) is a weapon in Deus Ex: Human Revolution.

Characteristics
The Buzzkill TND instantaneously knocks individual targets unconscious at close range. Also useful on bots and electronic devices to confuse them temporarily, the stun gun is made by Mustang Arms Ad-Tech Ltd. As both are ranged, non-lethal firearms which can only load one shot at a time, both the stun gun and its cousin the PAX-22 fill a similar niche, albeit at different ranges. The small stun gun is only useful at short-shorter medium ranges, but can affect non-human targets. With its scope, the PAX-22 is best used at sufficient range for the scope to not interfere with aim.

In-game Description
The Buzzkill Threat Negation Device (TND) is a single-shot, non-lethal firearm that uses an intense electroshock discharge to render targets unconscious. While easy to conceal, the weapon has a short range, slow firing cycle, and lengthy reload time. It is primarily for use against organic targets, but is also effective in temporarily disabling security camera, turrets and bots.

The stun gun is best reserved for situations where patrolling enemies must be incapacitated quickly, but the player is too far away for a takedown. As takedowns freeze time and render the player temporarily invulnerable, a one-two punch of a takedown on one target, then a quick shot with an already equipped stun gun on another target is a quick and easy tactic for incapacitating two enemies at once, useful for when pairs of enemies are standing within close range, a common occurrence.

Locations

 * The stun gun can be first received from David Sarif during the first mission, by requesting a close-range nonlethal weapon.
 * One can be purchased from Seurat.
 * It can be found, along with some darts, in a locked lot in Detroit. Hacking capture level 2 is required, or there is a Pocket Secretary on the wall nearby that has the locker code.
 * Another Stun Gun can be found in the back of a red cargo truck near the entrance of FEMA Dentention Center.
 * Inside the FEMA detention center, at the top of the stairs to the top level of the initial area, lift a crate to get a Stun Gun inside an open crate.
 * One can be found during the fight with Barrett, in one of the boxes.
 * At least two Stun Guns can be found in the news building in Montreal.
 * A Stun Gun can also be found at Sarif headquarters in a secluded underground area near the helipad. The Stun Gun itself is behind a level 5 locked door.
 * A Stun Gun and some darts can be found in an alley due west of The Hive in Kuigan District in Lower Hengsha. Either using the jump ability or stacking a box to get over the fence.
 * A Stun Gun and darts can be found in Tai Yong Medical. Through a vent in the section D control room occupied by two guards.