BPT:  SI/200 two entrance switching relay for system 200 audio systems.
 
This usit is designed for use in two entrance systems. When a visitor makes a call from the first entrance, the switch relay transfers the call from that panel to the audio handset of the flat being called. Similarly when a visitor calls from the second panel, all the call and speak and release functions are transfered to suit.
 
Features:
Allows the residence to communicate and control the opening of multiple entrances
Can be used in an audio entry installation with a maximum of two entrances
An additional unit will be required for every other entrance.

 
Depending on numbers - installation may require the use of an AS/200 additional power supply.