1. Product Overview
The BroadLink SC4B4 Wireless Smart Button Scene Switch is designed to enhance your home automation experience. Utilizing FastCon technology, this device offers instant pairing, low power consumption, and a stable, gateway-free self-organizing network. It allows you to activate pre-configured scenes and control compatible smart devices with simple button presses.
What's in the Box:
- BroadLink SC4B4 Wireless Smart Button Scene Switch
- 1 x CR2430 Battery (pre-installed or included separately)

Image 1.1: The BroadLink SC4B4 Smart Button Scene Switch shown alongside a smartphone displaying the BroadLink app interface, illustrating the device and its digital control capabilities.
2. Safety Information
Please read and understand all safety instructions before using this product. Failure to follow these instructions may result in fire, electric shock, injury, or damage to the product or property.
- Battery Safety: This device uses a CR2430 coin cell battery. Keep batteries out of reach of children. If swallowed, seek immediate medical attention. Dispose of used batteries properly according to local regulations. Do not expose batteries to excessive heat or direct sunlight.
- Usage Environment: Use the device in dry indoor environments only. Avoid exposure to moisture, extreme temperatures, or corrosive substances.
- Cleaning: Clean the device with a soft, dry cloth. Do not use liquid cleaners or aerosols.
3. Product Features
The BroadLink SC4B4 Scene Switch incorporates several features for convenient smart home control:
- FastCon Technology: Enables instant pairing, low power consumption, and a stable, self-organizing network without requiring a dedicated gateway.
- Out-of-Box Use: Pre-configured for immediate functionality with compatible BroadLink devices.
- Long Battery Life: Powered by a replaceable CR2430 battery, offering up to 2 years of operation.
- One-Tap Scene Setting: Easily save and activate custom scenes directly from the switch.
- Auto & One-Step Setup: Simplified pairing process with the BroadLink FastCon app.
- Alexa Routine Triggers: Can be configured to trigger Alexa routines for broader smart home integration.
- Wireless Dimmer: Long press buttons 1/2 to adjust the brightness of compatible lights (e.g., BroadLink LB4E26 Smart Bulb).
- Wireless Color Temperature Control: Long press buttons 3/4 to tune the color temperature of compatible lights from cool to warm (requires FastCon GW4C bulb or similar).
- Fully Wireless Installation: Portable design allows placement anywhere or attachment to surfaces without cables.

Image 3.1: A diagram illustrating the key features of the BroadLink FastCon Scene Switch, including its wireless capabilities and integration options.
4. Setup Guide
4.1 App Installation
- Download the BroadLink FastCon app from your smartphone's app store (available for Android and iOS).
- Open the app. Account creation is not required for basic functionality.
4.2 Device Pairing
Ensure the scene switch is within 5 meters of your smartphone during the pairing process.
- In the BroadLink FastCon app, tap the '+' icon or navigate to the 'Add Devices' option.
- Press and hold any two diagonal buttons (e.g., Button 1 & 4 or Button 2 & 3) on the scene switch for approximately 4 seconds. All indicator lights on the switch will illuminate, indicating it has entered Bluetooth configuration mode.
- The device should automatically appear as a pop-up in the app. Follow the on-screen prompts to complete the pairing process.
- Once paired, assign the switch to a specific room within the app. Each button is associated with a preset scene for that room.

Image 4.1: A user interacting with their smartphone to set up the BroadLink Smart Button Scene Switch, highlighting the ease of the setup process.
5. Operating Instructions
5.1 Activating Scenes
After pairing and assigning the switch to a room, each button on the SC4B4 switch is linked to a preset scene. Simply press a button to activate the corresponding scene in the assigned room. These scenes can also be activated via the app.
5.2 Wireless Dimming (with compatible bulbs)
To dim or brighten lights, ensure you are using compatible BroadLink smart bulbs, such as the LB4E26 model.
- To Dim/Brighten: Long press Button 1 or Button 2. The brightness of the linked lights will adjust gradually. Release the button when the desired brightness is reached.

Image 5.1: An illustration showing the top two buttons of the BroadLink Smart Button Scene Switch used for wireless dimming of connected lights.
5.3 Wireless Color Temperature Control (with compatible bulbs)
To adjust the color temperature of lights, ensure you are using compatible BroadLink FastCon bulbs, such as the GW4C model.
- To Tune Color Temperature: Long press Button 3 or Button 4. The color temperature of the linked lights will shift from cool to warm. Release the button when the desired temperature is reached.

Image 5.2: An illustration showing the bottom two buttons of the BroadLink Smart Button Scene Switch used for wireless color temperature control of connected lights.
5.4 Customizing Scenes
You can customize the actions associated with each button within the BroadLink FastCon app. This allows you to create personalized scenes for different activities or moods.

Image 5.3: The BroadLink app interface demonstrating how to save a new ambiance or scene with a single tap, allowing for personalized control.
6. Maintenance
6.1 Battery Replacement
The BroadLink SC4B4 uses a CR2430 coin cell battery, which typically lasts up to 2 years. When the battery is low, the device's performance may be affected, or it may stop responding.
- Locate the battery compartment on the side or back of the scene switch.
- Use a small tool (e.g., a flathead screwdriver) to gently open the compartment.
- Remove the old CR2430 battery.
- Insert a new CR2430 battery, ensuring the positive (+) side is facing up.
- Close the battery compartment securely.

Image 6.1: An illustration depicting the BroadLink Smart Button Scene Switch and its CR2430 coin cell battery, emphasizing its long operational life.
6.2 Cleaning
To maintain the appearance and functionality of your scene switch, wipe it regularly with a soft, dry cloth. Do not use abrasive cleaners, solvents, or chemical sprays.
7. Troubleshooting
- Device not pairing:
- Ensure the scene switch is within 5 meters of your smartphone during pairing.
- Verify that the battery is correctly installed and has sufficient charge.
- Confirm that Bluetooth is enabled on your smartphone.
- Try restarting the BroadLink FastCon app and repeating the pairing steps.
- Buttons not responding:
- Check the battery level and replace if necessary.
- Ensure the switch is still paired with the app and assigned to a room.
- Verify that the target smart devices (e.g., bulbs) are powered on and connected to the BroadLink ecosystem.
- Dimming or color temperature control not working:
- Confirm that you are using BroadLink FastCon compatible bulbs (e.g., LB4E26 for dimming, GW4C for color tuning).
- Ensure the bulbs are properly paired and responsive within the BroadLink app.
- Alexa integration issues:
- Ensure your BroadLink account is correctly linked to your Alexa account.
- Verify that the scenes or routines triggered by the switch are properly configured in the Alexa app.
- Some advanced integrations may require a BroadLink Mini Hub (GW4C) for full functionality.
8. Specifications
| Specification | Detail |
|---|---|
| Model Number | SC4B4 |
| Operation Mode | Manual |
| Operating Voltage | 3 Volts |
| Contact Type | Normally Open |
| Connector Type | Wireless (BroadLink FastCon) |
| Terminal | Wireless |
| Circuit Type | 1-way |
| Actuator Type | Push Button |
| Contact Material | Acrylonitrile Butadiene Styrene (ABS) |
| International Protection Rating | IP00 |
| Number of Positions | 4 |
| Controller Type | Android, iOS |
| Control Method | App |
| Connectivity Protocol | FastCon |
| Color | White |
| Wattage | 10 watts (for compatible bulbs) |
| Item Weight | 5.3 ounces |
| Batteries | 1 CR2430 battery required (included) |
| Manufacturer | Hangzhou BroadLink Technology Co., Ltd. |
9. Warranty and Support
BroadLink provides a 1-year warranty for the SC4B4 Wireless Smart Button Scene Switch.
For technical assistance, BroadLink offers 24/7 unlimited technical support via messages. Please refer to the BroadLink FastCon app or the official BroadLink website for contact information and additional resources.
Video guides and further information can often be found on the product pages or within the BroadLink support sections online.





