1819 Information Phone / One Button Voice Communication

• ✓ Full Duplex Communication for Simultaneous Two-Way Conversation
• ✓ Single Button Operation for Simplified Visitor Access Control
• ✓ Door Release Command via Key 9 for Remote Access Granting
• ✓ Compatible with Analog, Digital, and VoIP Telephone Lines
• ✓ Automatic 10 or 11 Digit Dialing for Quick Connection
• ✓ Includes 16 VAC 20 VA Transformer for Easy Installation