V-2904 - Valcom 4 DOOR ANSWERING DEVICE - ACTIVATES DOOR LOCKS -- FOUR ZONE/TALKBACK DOOR ENTRY

4 Door Answering Device - Activates Door Locks - Four zone/talkback door entry control for handsfree communication with remote call in. Provides background music input with volume control, door unlock contact closure, built-in ring generator with on/off switch, alarm function input, places simultaneous calls in queue.- Provides Handsfree Talkback Communication Between Up To 4 Entryways And A Telephone.- Transmit And Receive Volume Controls.- Built In 90 V 30 Hertz Ring Generator With On/Off Switch.- Integral Battery Backup Input.- Distinctive Ringing Option.- Programmable Number Of Ring Cycles.- Ringing Automatically Discontinues After Programmed Number Of Cycles Or Upon Answer.- Compatible With All Valcom Doorbox Speakers.- Interfaces With Telephone System Via Loop Start Or Ground Start C.O. Line Position.- May Be Accessed From A Dedicated Single Line Telephone Set.- Supports Call Buttons At All Speaker Locations.- Tone At Door Speaker When Call Button Activated.- Standard 66 Block Used For Connections.- Normally Open And Normally Closed Door Unlock Relay Contacts.- Door Unlock Relay Available On A Per Door Basis.- Programmable Door Unlock Codes.- Alarm Functions.- Simultaneous Calls Placed In Queue.- Background Music Input.- One Way All Call To All Speakers.- Optional Alert/Repeated Alert Tone.