Key features:

Video & Communication Integrated Camera: High-resolution camera (likely CMOS, $700$ TVL or HD) for clear identification of visitors..

Night Vision: Built-in Infrared (IR) LEDs to provide illumination for clear video in low-light or at night.

Two-Way Talk: Allows communication between the visitor at the gate and the resident inside (via the monitors).

Wide Viewing Angle: Designed to capture a broad area around the main gate.

Access & Security Digital Keypad/Buttons: Uses a digital keypad or dedicated call buttons for visitors to contact the intended resident (the "V313" likely indicates a specific number of buttons or an apartment/villa style).

Access Control Reader: Often includes a built-in RFID or ID Card Reader for authorized residents to swipe a card/fob to gain entry.

Remote Unlock: Integrates with an electric lock/strike plate, allowing residents to remotely unlock the gate using the indoor monitors.

Outdoor Rating: Durable construction (often Aluminum Alloy or similar metal casing) with a high environmental rating (e.g., IP54/IP65) to resist dust and water for outdoor installation.

System Compatibility Digital Bus: Designed to connect to the Lenyo digital system using a common cable or bus structure.

Multi-Monitor Support: Specifically designed to work with multiple indoor monitors (like the four you mentioned) on the same system.