Introduction
The KERUI MC11 is a 433MHz wireless window/door magnet sensor detector designed for home security alarm systems. This sensor provides reliable detection of opened doors or windows, immediately sending a signal to your compatible KERUI alarm system. It features high-performance and low power consumption, ensuring long-lasting operation and effective security monitoring. The system then alerts you via SMS or call, providing peace of mind.

Setup and Installation
1. Battery Installation
The KERUI MC11 sensor is powered by a CR2032 battery. Ensure the battery is correctly inserted according to the polarity markings inside the battery compartment.

2. Network Configuration (for TuyaSmart APP)
To connect your device to the TuyaSmart APP, follow these steps:
- Ensure your phone is connected to a 2.4GHz Wi-Fi network.
- Open the Bluetooth function on your phone.
- Open Location Services in your phone's "Privacy" settings and authorize it for the TuyaSmart APP. You can choose "While Using the App" or "Always".
Once these prerequisites are met, open the TuyaSmart APP and select "Add Device". The app should detect the device via Bluetooth. Follow the on-screen prompts to enter your Wi-Fi information and complete the pairing process.
3. Adding Accessories (Sensors/Remotes)
To add additional sensors or remote controls to your alarm system via the APP:
- In the TuyaSmart APP, navigate to the device control interface.
- Tap on "Accessories".
- Select the "+" icon to add a new accessory.
- Trigger the accessory (e.g., press a button on the remote, separate the magnetic parts of a door sensor) when prompted by the app.
- Confirm successful addition in the app.

Operating Instructions
1. Alarm Trigger Mechanism
The KERUI MC11 sensor operates on the principle of magnetic separation. When the two parts of the sensor (main unit and magnet) are separated, indicating an open door or window, it triggers an alarm. This signal is then sent wirelessly to your KERUI alarm system panel.

Upon receiving the alarm signal, the system panel will:
- Sound an audible alarm.
- Send an SMS notification or make a call to your preset phone number.
- You will receive the notification immediately on your smartphone via the TuyaSmart APP.


2. Detector Zone Modes
You can configure different zone modes for your detectors within the TuyaSmart APP. The behavior of the WiFi Alarm Hub depends on the selected detector zone mode and the current arming status (Disarm, Away Arm, Home Arm).
| Detector Zone Mode | Disarm | Away Arm | Home Arm |
|---|---|---|---|
| Normal | X | O | O |
| Delay | X | O | O |
| At Home | X | O | X |
| Home with Delay | X | O | X |
| 24 Hours | O | O | O |
| 24 Hours Silent | O | O | O |
| Off | X | X | X |
Note: "X" means the WiFi Alarm Hub will not trigger, "O" means the WiFi Alarm Hub will trigger.
Maintenance
1. Battery Replacement
The sensor uses a CR2032 button cell battery. When the battery is low, the sensor may indicate this (e.g., via a low battery light or app notification). To replace the battery:
- Carefully open the sensor casing.
- Remove the old CR2032 battery.
- Insert a new CR2032 battery, ensuring correct polarity.
- Close the sensor casing securely.
2. Cleaning
Wipe the sensor's exterior with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as these can damage the device.
Troubleshooting
- Sensor not triggering alarm:
- Check if the sensor's battery is dead or low. Replace if necessary.
- Ensure the sensor parts are correctly aligned and within the recommended separation distance (typically a few millimeters).
- Verify that the sensor is properly paired with the alarm system panel.
- Check the detector's zone mode in the TuyaSmart APP. Ensure it is set to a mode that triggers the alarm (e.g., Normal, Delay, 24 Hours).
- No notifications on phone:
- Confirm your phone has an active internet connection.
- Check if the TuyaSmart APP has the necessary permissions (e.g., notifications, location services).
- Ensure your alarm system panel is connected to the internet and functioning correctly.
- Compatibility issues:
This sensor cannot be used independently. It needs to work with a compatible KERUI alarm system panel that shares the same parameters (e.g., 433MHz frequency). It is not universal for all alarm panels. If you are unsure about compatibility, please contact the seller before purchasing.
Specifications
| Feature | Specification |
|---|---|
| Brand Name | KERUI |
| Model Number | MC11 |
| Type | Wireless Window Door Magnet Sensor Detector |
| Material | ABS |
| Operating Power | CR2032 Battery (included) |
| Transmission Frequency | 433MHz |
| Shock Resistance | 4.7M, 1.2M, 3.5M, 300k |
| Transmission Distance | 50-150m in open area |
| Feature 1 | High-performance and low power consumption |
| Feature 2 | Work for KERUI Security Alarm system |
| Origin | Mainland China |
User Tips
- For optimal performance, install the sensor on the main entry points of your home, such as front doors, back doors, and easily accessible windows.
- Regularly check the battery status through the TuyaSmart APP to ensure continuous protection.
- Test the sensor periodically after installation or battery replacement to confirm it is communicating correctly with your alarm panel.
- Consider using "Delay" zone mode for entry/exit doors to allow time for arming/disarming without triggering an immediate alarm.
Warranty and Support
For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact the KERUI Official Store directly. Ensure you have your product model number (MC11) and purchase details ready for faster service.