KERUI Wireless Door/Window Sensor Security Alarm System

1. Introduction

The KERUI Wireless Door/Window Sensor Security Alarm System is designed to provide real-time detection when doors and windows are opened. This kit includes a main alarm host, magnetic sensor, and remote control. Its sleek design integrates well with home decor. When the magnetic sensor is separated from the host, it triggers an immediate 120dB alarm to deter intruders. The system is expandable and can connect with various accessories such as infrared detectors, smoke detectors, gas detectors, and emergency buttons.

Figure 1: KERUI Wireless Door/Window Sensor Alarm System (Example Configuration)

2. What's in the Box

• Alarm Host (Main Unit)
• Magnetic Sensor (Small Unit)
• Remote Control(s)
• Double-sided adhesive tape

3. Setup

3.1. Battery Installation

1. Gently slide open the back cover of the Alarm Host.
2. Insert two (2) AAA 1.5V batteries, ensuring correct polarity (+/-). (Batteries are not included).
3. Close the back cover securely.

3.2. Mounting the Sensor

1. Clean the surface where the host and magnetic strip will be installed.
2. Attach the Alarm Host to the fixed door or window frame using the provided double-sided adhesive tape.
3. Attach the Magnetic Sensor to the movable part of the door or window, aligning it with the Alarm Host.
4. Ensure the installation gap between the host and the magnetic sensor is no more than 0.4 inches (approximately 1 cm) when the door/window is closed.
5. Attention: Do not install outdoors or in places where the installation base is not strong. Keep the host away from other strong magnetic products.

3.3. Pairing with Remote Control and Accessories

The system can be paired with up to 30 accessories (remote controls, PIR motion detectors, additional door/window sensors).

1. Enter Pairing Mode: Long press the [SET] button on the Alarm Host for 5 seconds. The host will beep twice, indicating it is in pairing station mode.
2. Pair Remote Control: While in pairing mode, press any button on the remote control. The host will beep twice, confirming successful pairing. If the host beeps once, it means it was already matched.
3. Pair Other Accessories (e.g., PIR, additional sensors): While in pairing mode, trigger the accessory (e.g., move in front of a PIR sensor, separate a door sensor). The host will beep twice to confirm successful pairing.
4. Exit Pairing Mode: The host will automatically exit pairing mode after 20 seconds of inactivity, or you can short press the [SET] button once. If the host beeps 3 times, it means the memory is full (30 accessories).

Figure 2: System Expandability and Connectivity

4. Operating Modes

4.1. Power On/Off

• To power on the host, slide the power switch to the ON position. It will beep once.
• To power off the host, slide the power switch to the OFF position.

4.2. Arm/Disarm Mode

• Arm: Short press the [SET] button on the host for 1 second, or press the 'Arm' button on the remote control. The host will beep once, indicating it is armed. In this state, if the host and door sensor separate, the alarm will trigger.
• Disarm: Short press the [SET] button on the host for 1 second, or press the 'Disarm' button on the remote control. The host will beep twice, indicating it is disarmed.

4.3. Alarm Mode (120dB)

When the system is armed and the magnetic sensor is disconnected from the host (e.g., a door or window is opened), the D121 alarm system will issue a loud 120dB warning to prevent theft and unauthorized access.

Figure 3: 120dB Louder Alert in action

4.4. Door Open Chime Mode

This mode provides an audible chime when a door or window is opened, useful for monitoring entry/exit without triggering a full alarm.

4.5. Emergency SOS Mode

The remote control typically includes an SOS button. Pressing this button can trigger an immediate alarm, useful in emergency situations.

Figure 4: Various Operating Modes of the System

5. Maintenance

5.1. Low-Battery Indication

When the door magnet's battery is low, the alarm time of the door magnetic host will be shorter, and the alarm sound will be smaller. The lower the battery power, the smaller the alarm sound. Eventually, the door magnet host may not alarm. Replace the batteries promptly when you notice these signs to ensure continuous protection.

5.2. Battery Replacement

Follow the battery installation steps (Section 3.1) to replace old batteries with new AAA 1.5V batteries.

6. Troubleshooting

6.1. Factory Reset

To restore the host to factory settings and delete all paired accessories:

1. Ensure the host is powered on.
2. Press and hold the [SET] button on the Alarm Host.
3. Continue holding until the host beeps 10 times.
4. Release the button. All accessories will be deleted, and the host will return to its factory default settings.

6.2. Remote Control Not Working

• Ensure the remote control has a working battery.
• Verify the remote control is properly paired with the alarm host (refer to Section 3.3).
• Ensure you are within the effective control range (up to 300 feet).

6.3. Sensor Not Triggering Alarm

• Check if the alarm host is in 'Arm' mode.
• Ensure the gap between the host and the magnetic sensor is within 0.4 inches when closed.
• Verify the host's batteries are not low.
• Ensure the sensor is properly paired with the alarm host.

7. Specifications

Figure 5: Long Control Range of the System

8. User Tips

• Battery Quality: For optimal performance and battery life, use high-quality alkaline AAA batteries. Check battery status periodically, especially if the alarm sound seems weaker.
• Placement: Ensure the sensor and magnet are securely mounted and aligned correctly. Avoid placing the host near strong magnetic fields or in areas prone to extreme weather if used outdoors (though indoor use is recommended).
• System Type: This is a standalone security alarm system. It does not connect to Wi-Fi, Alexa, or send notifications to mobile phones directly.
• Expandability: Consider adding PIR motion detectors or additional door/window sensors for comprehensive home security coverage.

Figure 6: Expandable System with various detectors

9. Warranty and Support

For any issues or support inquiries, please refer to your purchase documentation or contact the seller directly. Keep your proof of purchase for warranty claims.

For a detailed user manual in PDF format, please refer to the official document: KERUI Wireless Door Open Chime Kit User Manual (PDF)