A Burtt acoustic signaler was a piece of technology that was mounted on the front of R2-series astromech droids such as R2-D2.
- Star Wars: The Force Awakens: The Visual Dictionary
- Star Wars: Build Your Own R2-D2 1
A Burtt acoustic signaler was a piece of technology that was mounted on the front of R2-series astromech droids such as R2-D2.