The Pistoeka Sabotage Droid or commonly known as the Buzz Droid is a type of insect-like automatons that are deployed in swarms during battlefleet actions by the Confederacy of Independent Systems. They can wreak havoc upon squadrons of starfighters that happened to fly through a formation of such deployed droids. In some cases, Buzz Droids are deployed on humans which they can drill through the lifeforms and kill them. They are usually carried inside vulture droid missiles launched from Vulture-class droid fighters and Droid Tri-Fighters. They make a comeback for the New Confederacy of Independent Systems during The Last of the Droids era, helping Trench, Clu Lesser, Lott Dod, and Gume Saam fight the Galactic Empire.
Buzz Droids are intended to disable instead of destroy their targets. Since they were so effective when being deployed by Droid Tri-Fighters, the CIS retrofitted a number of Vulture Droids to carry them as well. HMP Droid Gunships were also retrofitted with vulture droid missiles during 20 BBY. The Buzz Droids also have simple maneuvering jets that helped them to move while still encased within their spheres. Once they came into contact with an enemy starship, they use a magnetic pad to gain a foothold. The outer shell is coated with a heat dissipating alloy that allowed it to penetrate enemy shields; it's also constructed of shock-absorbing materials.
The Buzz Droid's design is based off the pisto, a pest that lived in tropical regions on the planet Colla IV. When pressed for more droids by the Confederacy, the Colicoids took their existing repair droids and modified them to be saboteurs. They apparently communicated through chattering.