V-2901A - Valcom SINGLE DOOR ANSWERING DEVICE, ENHANCED, ACTIVATES DOOR LOCKS -- ONE ZONE/TALKBAC

Single Door Answering Device, Enhanced, Activates Door Locks -- One 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.- Provides Handsfree Talkback Communication Between An Entryway And A Telephone.- Transmit And Receive Volume Controls.- Built In 90 V 30 Hertz Ring Generator With On/Off Switch.- Distinctive Ringing Option.- Programmable Number Of Ring Cycles.- Interfaces With Telephone System Via Loop Start Or Ground Start C.O. Line Position.- Normally Open And Normally Closed Door Unlock Relay Contacts.- Background Music Input.- Integral Battery Backup Input.- Compatible With All Valcom Doorbox Speakers.- May Be Accessed From A Dedicated Single Line Telephone Set.- Supports Call Button At Speaker Location.- Tone At Speaker When Call Button Activated.- Standard 66 Block Used For Connections.- Alarm Functions.- Optional Alert/Repeated Alert Tone.- Requires Power Supply.