Number of entrances - 1 (Expandable to 8)
No. Of cores to videophone - 2
PSU - 32Vdc
Recommended cable type - CM2
Maximum number of call buttons - 2
Maximum No. Of videophones per call button - 4
Lock output - 12Vdc or dry contact
Videophone model - 3688
PSU model - 2321
Amplifier module - 4333/C