LR-57 combat droid/Legends

LR-57 combat droid, also called Retail droids, were battle droids used by the Confederacy of Independent Systems during the Clone Wars. Primarily used as sentinels, these Battle droids stood on two bipedal legs and had two arms, each equipped with two blaster cannons, four in all. They could be left dormant for long periods of time while their sensitive dorsal antennae searched for specific types of signals, activity, or other disturbances, enabling the droids to be used as living mines.

History
In the Battle of Christophsis, orange-colored LR-57s were used as guards of the energy shield projector. When Anakin Skywalker and Ahsoka Tano inadvertently stumbled into a droid minefield on their approach to disable the generator, several of the droids broke through the ground where they had been waiting and met them in defense. While they outnumbered the two Jedi, their sluggish reactions made them easy prey; half of them were destroyed by Skywalker, the rest were crushed by Ahsoka pulling down a wall on top of them.

Behind the scenes
The retail droid's design is based after early concept art of the droideka. The Droid's official name was first mentioned in The Clone Wars Campaign Guide

Appearances

 * Star Wars: The Clone Wars (novel)
 * Star Wars: The Clone Wars (junior novel)
 * Star Wars: The Clone Wars (film)

Notes and references
Retail Droid