Valcom V-2901A audio intercom system

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.