The DT-12 was a heavy blaster pistol produced by BlasTech

BlasTech Industries Organization Manufacturers

and designed for species with long fingers such as Rodians

Rodian Sentient Species

.
Non-human humanoids prefer these blasters, due to their wider trigger guard and thicker handle allowing for larger hands and fingers to operate a conventionally sized blaster. Not to say that it did not see use among humans - it was merely used by non-humans more frequently.
The DT-12 required a power pack to operate and was able to fire 50 shots. This weapon had a close-range stun setting as well, meaning the wielder could switch the weapon to fire stun shots instead of lethal fire, however the close-range stun setting was limited to a range of only 9 meters. The DT-12 cost 900 credits to purchase, but its ownership and use was restricted to legitimate military organizations and police forces only.