1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your KERUI D121 Wireless Door Window Contact Sensor Alarm. This system is designed to enhance security for homes, shops, garages, and sheds, offering various alarm modes including a dedicated SOS function for elderly users. Please read this manual thoroughly before use to ensure proper functionality and safety.
2. Product Overview
2.1 Components
- Main Alarm Unit (Host)
- Magnetic Strip
- Remote Control
- Double-sided Adhesive Tape for Installation
Image 2.1: The KERUI D121 Wireless Door Window Contact Sensor Alarm system, showing the main alarm unit, its corresponding magnetic strip, and the remote control.
2.2 Key Features
- Simple Operation: Features only two keys ([ON/OFF] and [SET]) on the main unit for straightforward settings.
- Remote Control: Includes a remote for Arm, Disarm, SOS, and Doorbell functions.
- Loud Alarm: Emits a 120dB alarm when triggered, providing a clear alert.
- Wide Remote Range: Offers a remote control range of up to 300 feet.
- Expandable System: Can be matched with up to 30 accessories, including additional remote controls, door sensors, and PIR motion detectors.
- Multiple Alarm Modes: Supports Normal Alarm, Doorbell, and SOS modes.
- Battery Powered: Operates on 2 replaceable AAA batteries (not included).
Image 2.2: Detailed view of the KERUI D121 alarm unit and remote control, highlighting dimensions and button functionalities such as Arm, Disarm, Doorbell/Alarm Switch, and SOS.
3. Setup and Installation
3.1 Battery Installation
- Open the battery compartment on the main alarm unit.
- Insert 2 AAA 1.5V batteries, ensuring correct polarity.
- Close the battery compartment securely.
Image 3.1: Illustration of battery installation for the KERUI D121 alarm unit, showing the placement of two AAA 1.5V batteries. Also depicts the use of double-sided tape for mounting.
3.2 Mounting the Alarm Unit and Magnetic Strip
- Placement: It is recommended to place the door sensor alarm 6-8 inches above the ground.
- Surface Preparation: Ensure the installation surface is strong, clean, and dry.
- Attachment: Use the provided double-sided adhesive tape to fix the main alarm unit and the magnetic strip.
- Alignment: Install the main unit and magnetic strip separately on the door/window frame and the door/window itself. The gap between them must be ≤ 0.4 inch (approximately 1 cm) when the door/window is closed.
- Orientation: Ensure the alignment marks on both parts face each other.
Important Notes:
- The device is not waterproof. Do not install outdoors or in areas exposed to water.
- The installation base must be strong to ensure secure attachment.
Image 3.2: Examples of the KERUI D121 alarm unit installed on a door and a window, illustrating how the system can be expanded with additional sensors and PIR motion detectors for comprehensive home security.
3.3 Pairing Additional Accessories (Optional)
The D121 system can connect with multiple remote controllers and other sensors (e.g., infrared detectors, additional door sensors, emergency buttons). One door/window sensor can connect with multiple remote controllers, and one remote controller can also connect with different door sensors. The system supports up to 30 accessories.
Refer to the specific instructions provided with additional accessories for pairing procedures. Generally, this involves putting the main alarm unit into a pairing mode using the [SET] button and then activating the accessory.
Image 3.3: Visual representation of the system's expandability, showing how a single remote control can manage multiple door/window sensors, and how a single sensor can be controlled by multiple remotes within a home environment.
4. Operating Instructions
4.1 Main Unit Controls
- [ON/OFF] Switch: Located on the side of the main unit to power the device on or off.
- [SET] Button: Used for various settings. Long press or short press for different durations to access specific configurations, indicated by a 'beep' sound.
4.2 Remote Control Functions
The remote control provides convenient access to the primary functions of the alarm system:
- Arm Button: Activates the security alarm mode.
- Disarm Button: Deactivates the security alarm mode.
- Doorbell/Alarm Switch Button: Toggles between doorbell mode and alarm mode.
- SOS Button: Triggers an immediate emergency alarm.
Image 4.1: The remote control demonstrating its effective range of up to 300 feet, allowing control of the alarm system from various locations within a home.
4.3 Alarm Modes
The KERUI D121 offers three distinct operating modes:
- Security Alarm Mode: When armed, if the door or window is opened, the alarm will sound a loud 120dB alert to deter intruders.
- Door Open Chime Mode (Doorbell Mode): When activated, the system will emit a 'ding-dong' sound when the door or window is opened. This is suitable for shops or as a simple notification system at home.
- Emergency SOS Mode: Pressing the SOS button on the remote control will immediately trigger the alarm, providing a way for elderly individuals or those in distress to call for help.
Image 4.2: Visual explanation of the three operational modes: Security Alarm Mode for intrusion detection, Door Open Chime Mode for entry notification, and Emergency SOS Mode for urgent assistance.
Image 4.3: The D121 alarm system issuing a loud 120dB warning when the magnetic sensor is disconnected, designed to prevent unauthorized access.
5. Maintenance
5.1 Battery Replacement
The main alarm unit is powered by 2 AAA batteries. When the batteries are low, the alarm time will be shorter, and the alarm sound will be smaller. Replace batteries promptly to ensure optimal performance.
- Power off the main unit using the [ON/OFF] switch.
- Open the battery compartment.
- Remove the old batteries and insert new AAA 1.5V batteries, observing correct polarity.
- Close the battery compartment and power on the unit.
5.2 Cleaning
Wipe the device with a soft, dry cloth. Do not use liquid cleaners or abrasive materials.
6. Troubleshooting
- Alarm is weak or short: This indicates low battery. Replace the 2 AAA batteries in the main unit.
- Alarm does not trigger:
- Ensure the main unit is powered ON.
- Check if the main unit is in the correct alarm mode (not doorbell mode).
- Verify the gap between the main unit and the magnetic strip is ≤ 0.4 inch.
- Check battery levels.
- Remote control not working:
- Ensure the main unit is powered ON.
- Check the remote control's battery (if applicable, typically button cell).
- Ensure you are within the 300-foot operating range.
- Re-pair the remote control with the main unit if necessary (refer to pairing instructions).
- False alarms:
- Ensure the main unit and magnetic strip are securely mounted and do not shift.
- Verify the gap between the main unit and magnetic strip is consistent and within the specified limit.
7. Specifications
| Feature | Specification |
|---|---|
| Model | D121 |
| Brand | KERUI |
| Power Source | 2 x AAA 1.5V Batteries (Main Unit) |
| Voltage | 3 Volts (DC) |
| Noise Level | 120 dB |
| Control Method | Remote |
| Mounting Type | Door Mount (Adhesive) |
| Maximum Remote Range | 300 Feet (approx. 91 meters) |
| Sensor Technology | Contact Sensor |
| Magnetic Gap Requirement | ≤ 0.4 inch (approx. 1 cm) |
| Item Weight | 80 g |
| Color | White |
| Package Dimensions | 14.7 x 11.2 x 4.3 cm |
8. Warranty and Support
For warranty information and technical support, please refer to the product packaging or contact your retailer. Keep your purchase receipt for warranty claims.
