A prowler can be described as a flying droid that the Galactic Empire utilized for surveillance along the walkways of their first Death Star. This droid, shaped like a rectangular prism with a panel extending from either side, was fitted with a camera.
Luke Skywalker came across these droids during his exploration of the Death Star, which occurred shortly before he rescued Princess Leia Organa in 0 BBY.
The 1987 Japanese Star Wars game featured Prowlers, although the game's status as canon is uncertain. The Japanese language manual for the game revealed their designation, presenting it as プラウラー (purauraa) written in katakana characters.