Four call button door entry phone BT44

BT44 is a traditional doorphone with four keys. It connects by wire to up to four V801/B801 handsets.

Interface	5-wire cable to handset
Operating temperature	-35 to +50 °C. At 90% relative air humidity.
Operating temperature	12 to 24 VAC/DC
Current consumption	40 mA in standby
Dimensions (WxHxD)	80 x 200 x 40 mm