1. Introduction
The LoraTap 4th Generation US Tuya Smart Life WiFi Curtain Switch is designed to provide smart control over electric motorized blinds and roller shutters. This device allows you to manage your curtains through a mobile application, voice commands via smart assistants, or directly using its touch-sensitive panel. It integrates seamlessly with Smart Life and Tuya applications, offering features like percentage control, scheduling, and backlight management.
2. Safety Information
IMPORTANT SAFETY INSTRUCTIONS: RISK OF ELECTRIC SHOCK OR FIRE.
- Always turn off the power supply before installing, servicing, or removing the switch.
- Installation must be performed by a licensed electrician in accordance with all national and local electrical codes.
- This product is designed for indoor use only.
- The switch is compatible only with 4-wire classic AC motors. It cannot work with DC motors.
- Before using the app to control the shutter, ensure the wall manual switch is in the 'STOP' position to protect the motor.
Please verify your motor has 4 wires (Blue, Brown, Black, Green/Yellow) before installation.

Image: Important notes regarding motor compatibility and wiring.
3. Package Contents
Please check the box for the following items:
- 1 x WiFi Curtain Switch (White or Black, depending on your choice)
- 1 x English User Guide
- 2 x Screw Kits
- 1 x Terminal (for wiring assistance)
- 1 x Blue Wire (for wiring assistance)

Image: Contents of the product box including the switch, screws, user guide, terminals, and blue wire.
4. Specifications
| Feature | Specification |
|---|---|
| Model Number | SC400W-US-V4-WHI |
| Brand Name | LoraTap |
| Item Type | SWITCHES |
| Switch Type | Touch Panel Switch (REMOTE CONTROL) |
| Input Voltage | 100-250VAC, 50/60Hz |
| Output Voltage (Motor) | 100-250VAC, 50/60Hz |
| Max. Load | Below 600W |
| Current | 3A |
| Wireless Protocol | 2.4GHz Wi-Fi (802.11 b/g/n, does not support 5GHz Wi-Fi) |
| App Name | Smart Life, Tuya |
| Voice Control | Google Home, Amazon Alexa |
| Material | Fireproof ABS Plastic |
| Switch Dimensions | 120mm x 72mm x 39mm |
| Standby Power Consumption | Below 0.5W |
| Certification | RoHS, CE, FCC |
| Warranty | 2 years |
5. Installation
5.1 Wiring Diagram
The LoraTap WiFi Curtain Switch requires a 4-wire classic AC motor for operation. Ensure you have Live (L), Neutral (N), L1 (Motor Up), and L2 (Motor Down) wires available. A ground wire connection is also recommended for safety.

Image: Detailed wiring diagram showing connections for Live, Neutral, L1, L2, and Ground to a 4-wire motor.
5.2 Physical Installation
The switch is designed to fit US 503 standard size wall boxes. Ensure your wall box is compatible before installation.

Image: Dimensions of the switch, illustrating its compatibility with US 503 standard wall boxes.
6. Setup (App Pairing)
Follow these steps to pair your LoraTap WiFi Curtain Switch with the Smart Life or Tuya app:
- Power On: Ensure the switch is correctly wired and powered on.
- Enter Pairing Mode: Press and hold the middle 'Pause' button on the switch until the indicator light begins to blink rapidly.
- Open App: Launch the Smart Life or Tuya app on your smartphone.
- Add Device: Tap the '+' icon to add a new device. Select 'Curtain Switch' from the electrical category.
- Confirm Blinking: Confirm in the app that the indicator light on the switch is blinking rapidly.
- Connect: The app will scan for and add the device. Once successfully added, you can rename it and assign it to a room.
Video: Demonstration of wiring, app pairing, and basic app control for the LoraTap WiFi Curtain Switch.
7. Operation
7.1 App Control (Smart Life / Tuya)
Once paired, you can control your curtain switch from anywhere with an internet connection using the Smart Life or Tuya app.
- Open/Close/Stop: Use the virtual buttons in the app to fully open, close, or stop your curtains at any position.
- Percentage Control: The app features a new percentage function, allowing you to set the curtain opening to a specific percentage (e.g., 50% open).
- Timing Function: Set schedules for your curtains to open or close automatically at specific times (e.g., open at 7:00 AM, close at 7:00 PM).
- Backlight Control: Turn the switch's backlight on or off manually or via scheduled timers within the app.
- Group Function: Create groups within the app to manage multiple curtain switches simultaneously.
- Device Sharing: Share control of the device with family members through the app.

Image: App interface demonstrating the percentage control feature for curtain position.

Image: App interface showing options to control the backlight and set schedules for it.

Image: Screenshot of the app showing how to create and manage device groups.
7.2 Voice Control
The LoraTap WiFi Curtain Switch is compatible with Google Home and Amazon Alexa for hands-free voice control.
- Connect to Smart Assistant: Link your Smart Life/Tuya account to your Google Home or Amazon Alexa app.
- Voice Commands: Use commands such as "Alexa, open the curtain switch" or "Hey Google, close the curtain switch."

Image: Example of voice control integration with Amazon Alexa and Google Home.
7.3 Manual Touch Panel Control
The switch features a physical touch panel for direct control, offering an alternative to smartphone or voice commands.
- Up Arrow: Opens the curtain.
- Middle Pause Button: Stops the curtain.
- Down Arrow: Closes the curtain.

Image: Close-up of the physical touch panel for manual operation.
8. Troubleshooting / FAQ
- Q: The app control is not working.
- A: Ensure the wall manual switch is in the 'STOP' position. If it's in 'OPEN' or 'CLOSE', the app control may be overridden to protect the motor.
- Q: Can I use an RF remote control with this switch?
- A: No, this is a Wi-Fi only curtain switch and is not compatible with RF remote controls. Do not purchase separate RF remotes for this device.
- Q: My motor is a DC motor. Will this switch work?
- A: No, this smart shutter switch is designed to work only with 4-wire classic AC motors (100-250VAC). It is not compatible with DC motors.
- Q: The indicator light is not blinking during pairing.
- A: Ensure the switch is powered on. Press and hold the middle 'Pause' button for several seconds until the indicator light starts blinking rapidly. If it still doesn't blink, try cycling the power to the switch.
- Q: The switch is not connecting to my Wi-Fi network.
- A: Ensure your Wi-Fi network is 2.4GHz. This switch does not support 5GHz Wi-Fi. Also, check that your Wi-Fi signal is strong in the location of the switch.

Image: Visual reminder that RF remotes are not compatible with this WiFi-only switch.
9. User Tips
- For optimal performance and motor protection, always ensure the physical switch is in the 'STOP' position when controlling curtains via the app or voice commands.
- Utilize the scheduling feature in the Smart Life/Tuya app to automate your curtain movements, enhancing convenience and energy efficiency.
- Take advantage of the percentage control function for precise light and privacy management.
- If you experience connectivity issues, confirm your Wi-Fi network is 2.4GHz and that the switch is within range of your router.
10. Warranty and Support
The LoraTap WiFi Curtain Switch comes with a 2-year warranty, covering manufacturing defects and malfunctions under normal use. This warranty does not cover issues arising from personal error or improper installation.
For technical support, troubleshooting assistance, or any questions regarding your product, please contact the LoraTap Official Store. As an ISO9001 certified manufacturer, LoraTap is committed to providing quality products and support.

Image: ISO9001 certification logo, indicating quality manufacturing standards.





