1. Introduction
The ChunHee WI12BL 2-Way Window Speaker Intercom System is designed to facilitate clear and efficient voice communication across barriers such as glass windows or counters. This system is ideal for business environments like banks, hospitals, post offices, and restaurants, where direct contact may be limited. It features anti-interference technology and independent volume controls to ensure high-fidelity sound quality and smooth communication.
This manual provides detailed instructions for setting up, operating, and maintaining your intercom system, along with troubleshooting tips to ensure optimal performance.

Figure 1.1: ChunHee WI12BL 2-Way Window Speaker Intercom System.
2. Product Overview
2.1 Components
- Main Intercom Unit (Internal Unit) with Gooseneck Microphone and Internal Speaker
- External Speaker Unit (Outer Unit) with External Microphone
- Power Adapter (Charger)

Figure 2.1: Diagram illustrating the components and connections of the ChunHee WI12BL intercom system, including the main unit, external speaker, and power adapter.
2.2 Key Features
- Two-Way Communication: Enables simultaneous conversation between the internal and external units.
- High-Fidelity Sound: Equipped with a top-quality speaker and high-sensitive microphone to eliminate resonance and interference.
- Independent Volume Control: Separate adjustable volume controls for the internal and external speakers.
- Flexible Gooseneck Microphone: Allows for adjustable positioning of the internal microphone.
- Durable Design: Professional durable box structure suitable for various commercial environments.
- Recording Function: Includes a recording port for external recording devices (not included).

Figure 2.2: Detailed view of the main intercom unit, highlighting the gooseneck microphone, internal speaker, power LED, volume controls for inner and outer audio, and the power switch.

Figure 2.3: Diagram showing the dimensions of the main intercom unit and the external speaker, along with cable lengths for installation planning.
3. Setup Instructions
- Unpack Components: Carefully remove all components from the packaging. Ensure you have the main intercom unit, external speaker unit, and power adapter.
- Position the Main Unit: Place the main intercom unit on a stable surface on the internal side of the counter or window. Adjust the flexible gooseneck microphone to a comfortable speaking position.
- Position the External Unit: Mount or place the external speaker unit on the customer-facing side of the counter or window. Ensure the cable reaches the main unit without strain.
- Connect External Speaker: Plug the cable from the external speaker unit into the "Outer" port on the back of the main intercom unit.
- Connect Power: Plug the power adapter into the "Power" port on the back of the main intercom unit, then plug the adapter into a standard electrical outlet.
- Power On: Flip the ON/OFF switch on the main unit to the "ON" position. The power LED should illuminate.
4. Operating Instructions
- Power On/Off: Use the ON/OFF switch located on the main unit to turn the system on or off.
- Adjust Internal Volume: Use the "Inner Vol" knob on the main unit to adjust the listening volume for the internal speaker.
- Adjust External Volume: Use the "Outer Vol" knob on the main unit to adjust the listening volume for the external speaker.
- Two-Way Communication: Speak into the gooseneck microphone on the main unit. Your voice will be transmitted clearly through the external speaker. The external microphone will pick up the customer's voice, which will be played through the internal speaker.
- Optimizing Sound: Adjust both inner and outer volume knobs to a comfortable level for both parties to ensure clear communication without distortion or feedback. The anti-interference design helps maintain sound clarity.
- Recording Function (Optional): If you wish to record conversations, connect a compatible recording device (not included) to the "Rec" port on the back of the main unit.

Figure 4.1: Internal unit with gooseneck microphone and external speaker, demonstrating clear two-way communication.

Figure 4.2: Illustration of the intercom system in use at a service counter, facilitating clear communication between staff and customer without shouting.
Video 4.1: Official product video demonstrating the features and applications of the ChunHee WI12BL 2-Way Window Speaker Intercom System, including its flexible microphone, volume controls, and high-quality sound output.
5. Maintenance
- Cleaning: Regularly wipe the surfaces of both units with a soft, dry cloth. For stubborn dirt, use a slightly damp cloth and mild detergent, then wipe dry immediately. Do not use abrasive cleaners or solvents.
- Cable Management: Ensure all cables are neatly arranged and not subjected to excessive pulling or bending, which can cause damage.
- Environmental Conditions: Keep the intercom system away from direct sunlight, extreme temperatures, and high humidity. Avoid placing it near strong electromagnetic fields.
- Power Off When Not in Use: If the system will not be used for an extended period, turn it off and unplug the power adapter.
6. Troubleshooting
- No Power:
- Ensure the power adapter is securely plugged into both the intercom unit and a working electrical outlet.
- Check if the ON/OFF switch is in the "ON" position.
- Verify the electrical outlet is functional by plugging in another device.
- No Sound or Low Sound:
- Check both "Inner Vol" and "Outer Vol" knobs and ensure they are turned up to an audible level.
- Ensure the external speaker unit is properly connected to the "Outer" port.
- Confirm that the microphones are not obstructed.
- Distorted Sound or Feedback:
- Reduce the volume levels of both inner and outer speakers.
- Ensure there is sufficient distance between the internal and external units to prevent acoustic feedback.
- Check for any obstructions or interference sources near the units.
- One-Way Communication Only:
- Verify that both the internal gooseneck microphone and the external microphone are correctly positioned and unobstructed.
- Check the connections of the external speaker unit to the main unit.
7. Specifications
| Feature | Specification |
|---|---|
| Model Name | WI12BL |
| Material | Plastic |
| Speaker Type | Intercom/PA system speaker |
| Special Feature | Record, Speaker |
| Recommended Uses | Customer service, reception areas, indoor business communication, professional environments |
| Connectivity Technology | Wired |
| Audio Output Mode | Stereo, 2.0 Surround Sound |
| Input Voltage | 120 Volts |
| Mounting Type | Tabletop Mount |
| Item Weight | 1.26 pounds |
| Product Dimensions | 5.91 x 5.91 x 3.54 inches |
| Included Components | Charger |
| Batteries Required? | No |
8. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or contact your retailer. You may also visit the official ChunHee website for further assistance.