1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your ELRO DV477W2 Video Door Intercom System. This system is designed for two apartments sharing a single entrance, offering secure two-way communication and visual verification of visitors. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Package Contents
Verify that all components listed below are present in your package:
- 2 x Indoor Monitors (7-inch color screens)
- 2 x Mounting Brackets for Indoor Monitors
- 1 x Outdoor Unit (Waterproof Doorbell with Camera)
- 1 x Mounting Support with Rain Cap for Outdoor Unit
- 2 x 15-meter 4-wire Cables
- 2 x Power Adapters
- 1 x Set of Mounting Hardware (screws, wall plugs)
- 1 x User Manual
3. Product Overview
3.1 System Components
The ELRO DV477W2 system consists of an outdoor unit and two indoor monitors, enabling comprehensive video intercom functionality.

Figure 1: ELRO DV477W2 Video Door Intercom System
3.2 Outdoor Unit Features
The outdoor unit is equipped with a camera, microphone, speaker, and two bell pushes for individual apartments. It also features color night vision technology for clear images in low-light conditions.

Figure 2: Outdoor Unit Components and Recommended Mounting Height
- Microphone: Captures audio from visitors.
- Camera: Provides video feed to indoor monitors. Features an adjustable lens (55-degree viewing angle).
- Night View LEDs: Illuminates the area for clear night vision.
- Speaker: Outputs audio from indoor monitors.
- Bell Pushes: Two separate buttons for calling each apartment.
- Nameplates: Customizable slots for apartment names.

Figure 3: Outdoor Unit Rear View and Dimensions
3.3 Indoor Monitor Features
Each indoor monitor features a 7-inch color screen and intuitive buttons for communication, door/gate unlocking, and live view activation.

Figure 4: Indoor Monitor Front View and Controls
- Talk Button: Initiates two-way audio communication.
- Gate Unlock Button: Activates the gate release mechanism (if connected).
- Door Unlock Button: Activates the door release mechanism (if connected).
- Live View Button: Displays the camera feed without a visitor pressing the bell.

Figure 5: Indoor Monitor Side Controls
- Sound Volume: Adjusts the chime volume.
- Select Sound: Cycles through 16 different ringtones.
- Brightness: Adjusts screen brightness.
- Color Intensity: Adjusts screen color saturation.
- Talk Volume: Adjusts the volume of the two-way communication.
4. Setup and Installation
Important: Installation should be performed by a qualified technician or a person with sufficient electrical knowledge. Disconnect power before beginning installation.
4.1 Mounting the Outdoor Unit
- Choose a suitable location for the outdoor unit, typically near the entrance door. The recommended mounting height for the camera is between 1.35 and 1.7 meters from the ground (refer to Figure 2).
- Attach the mounting support with the rain cap to the wall using the provided screws and wall plugs. Ensure it is level and securely fastened.
- Connect the 4-wire cable and any optional door/gate unlock wires to the outdoor unit's terminals.
- Secure the outdoor unit onto the mounting support.
4.2 Mounting the Indoor Monitors
- Select a convenient indoor location for each monitor, such as a hallway or living area.
- Attach the indoor monitor mounting bracket to the wall using the provided hardware.
- Connect the 4-wire cable from the outdoor unit to the indoor monitor's terminals. Ensure correct polarity.
- Connect the power adapter to the indoor monitor and plug it into a power outlet.
- Mount the indoor monitor onto its bracket.
4.3 Wiring Diagram (General)
The system uses a 4-wire connection between the outdoor unit and each indoor monitor. Additional wires are required for electric door/gate locks. Refer to the detailed wiring diagram in the included paper manual for specific connections.
5. Operation
5.1 Receiving a Call
- When a visitor presses a bell push on the outdoor unit, the corresponding indoor monitor will ring and display the visitor's image.
- Press the Talk button (phone icon) on the indoor monitor to initiate two-way communication.
5.2 Two-Way Communication
After pressing the Talk button, you can speak with the visitor. To end the conversation, press the Talk button again or the system will automatically hang up after a set period.
5.3 Door/Gate Unlocking
- To unlock the door, press the Door Unlock button (key icon) during a call or live view.
- To unlock the gate, press the Gate Unlock button (gate icon) during a call or live view.
5.4 Live View
To view the outdoor camera feed at any time without a visitor, press the Live View button (person icon) on the indoor monitor.
5.5 Adjusting Settings
Use the adjustment knobs on the side of the indoor monitor (refer to Figure 5) to customize:
- Sound Volume: Adjusts the volume of the incoming chime.
- Select Sound: Choose from 16 different melodies for the doorbell chime.
- Brightness: Controls the display brightness.
- Color Intensity: Adjusts the color saturation of the display.
- Talk Volume: Adjusts the volume of the two-way conversation.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surfaces of the outdoor unit and indoor monitors. Do not use abrasive cleaners or solvents.
- Outdoor Unit: Periodically check the outdoor unit for any obstructions to the camera or microphone. Ensure the rain cap is securely in place.
- Cables: Ensure all cables are securely connected and free from damage.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No image on indoor monitor | Loose cable connection; Power issue; Camera malfunction. | Check all 4-wire connections. Ensure power adapter is plugged in. Contact support if problem persists. |
| No sound during communication | Volume too low; Microphone/speaker obstruction; Wiring issue. | Adjust talk volume on the indoor monitor. Check for obstructions on outdoor unit. Verify wiring. |
| Door/gate unlock not working | Incorrect wiring to electric lock; Lock power issue. | Review wiring diagram for electric lock connections. Ensure the electric lock has power. |
| Monitor not turning on | Power adapter not connected or faulty; Power outlet issue. | Check power adapter connection and power outlet. Try a different outlet. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | DV477W2 |
| Manufacturer | ELRO Europe |
| Indoor Monitor Screen Size | 7 inches (18 cm) Color |
| Outdoor Unit Dimensions (L x W x H) | 8 x 6 x 20.6 cm |
| System Weight | 3.18 kg |
| Camera Viewing Angle | Adjustable 55 degrees |
| Night Vision | Color Night Vision Technology |
| Power Type | AC/DC (via included adapters) |
| Number of Apartments Supported | 2 |
| Ringtones | 16 different melodies |
| Connectivity | Wired (4-wire system) |
9. Warranty and Support
ELRO products are designed for reliability and performance. For warranty information, please refer to the documentation included with your purchase or visit the official ELRO website. If you encounter any issues or require technical assistance, please contact ELRO customer support. Have your model number (DV477W2) and purchase details ready when contacting support.







