The Sentry Droid was a model of probe droid based on based on SEN-A01 design and produced during the Cold War. Balmorran Resistance fighters utilized the sentry droids at Outpost Victory during their struggle against the Imperial occupation of Balmorra. These droids were typically armed with a toxin and ion weapons, and were able to deploy electric shield which surrounds the droid and does minor energy damage to all melee attackers.