LS-66 Sabre Direct Energy Rifle

The LS-66 Sabre Direct Energy Rifle (DER) is a weapon in Deus Ex: Human Revolution.

Characteristics
The LS-66 does not fire a set number of "rounds". Instead, it uses batteries, which have an initial charge of 500, which is about ten seconds of sustained fire. While the weapon does have an overheat gauge like the M404 Heavy rifle, it does not seem to heat up when the fire button is held, a possible bug in the initial PC release.

Jean-Francois Dugas, main designer of Deus Ex: Human Revolution says:

"It's a weapon that allows you to shoot through walls so you just have to shoot, really. Combined with the Smart Vision (augmentation to see through walls) it makes for deadly combo. However, I'm telling you right away, it's a very difficult weapon to get..."

Locations

 * One of these weapons is found behind Tong Si Hung at the Harvester hideout at the conclusion of the mission Find Vasili Sevchenko's GPL Device. You can also find ammunition (500) in a safe (the one in the container) in the hideout, and sitting on a desk (500) near where the electrified room is (by the switch to turn off the electricity).
 * In Singapore, inside of a storage room near an outdoor bot patrol shortly before Jensen uploads the virus.
 * Inside the room where Namir is fought.
 * At Panchaea, there is laser battery ammunition.
 * At the start of the level, in a red crate high on the left-hand pile.
 * The body left of the entrance to the room where you find Taggart.
 * On the desk in the room where you find Taggart.
 * In the locker on the east side of the room where you find Sarif.

Bugs

 * Using the secondary fire key allows the player to look through the telescopic sight on the weapon, providing minor zoom and centering the laser beam on the screen. On the PC version, however, there is a bug where neither the texture for the scope, nor the crosshair appears.
 * The model for the weapon has the scope mounted on the right-hand side of the barrel, where it would be impossible for a right-handed person (eg. Adam) to use.