This compact unit is fitted to the entrance panel on all current BSTL door entry systems.
BSTL Speech amplifier - Mod61
This BSTL Speech amplifier provides two way speech for the BSTL entry systems and has individual volume control for both microphone and speaker.
This universal product can be powered from either 12V AC or 12V DC depending on the model of telephone used.
Dimensions: H 100mm x W 60mm x D 30mm