Def-Tech is a security droid available in the Droids-B-Us store.
Salesbug description[]
Ah! This model is one of my personal favorites. It was produced exclusively for Droids-B-Us by a small planet who used these mechanical warriors to fight their battles. That race killed themselves off, however, and spare parts are nearly impossible to find. Don't bother haggling. This one's worth 55 buckazoids for the parts alone. That would be 46 buckazoids with a coupon.
Behind the scenes[]
Because of its low price, the Def-Tech can be purchased by Roger Wilco, but then he will be delivered only a crate of its parts, which are unusable. FB-001 will remark that he sprained his termodiodinal-tricycler carrying it for him.
The design of the droid is inspired by the Rifleman, a 60 BattleMech from the Battletech universe, it's backstory also alludes to this, both with the play on them being called mechanical warriors and spare parts being hard to find. However, it is much smaller than in the source material. It also resembles the Destroid Defender which is where the design was copied from.
The reference may have been made due to the first MechWarrior having been developed by Dynamix.