MCJ-43 – Wireless Door Sensor

[Product Name]

Product Overview

The NAVKAR SYSTEMS MCJ-43 433MHz Wireless Door & Window Magnetic Sensor is a compact wireless security sensor designed to monitor the opening of doors, windows, drawers, cabinets and other access points. When the magnetic contact and transmitter are separated, the sensor detects the opening and sends a 433MHz RF signal to a compatible alarm host, allowing the connected security system to generate an alarm or notification.

The sensor uses a two-piece magnetic detection design consisting of a main transmitter and a separate magnetic contact. It is designed for simple installation and can be used in residential and commercial security applications such as homes, schools, factories, communities, shops, stores and villas.

Main Purpose

The primary purpose of the MCJ-43 is to provide wireless opening detection for protected entry points.

When the door or window is closed, the transmitter and magnetic contact remain close together. When the protected opening is moved, the two parts separate, triggering the sensor. The sensor then transmits the detection signal wirelessly to the compatible alarm host.

Important: The MCJ-43 is a wireless alarm-system sensor. It is intended to work with a compatible alarm host and should not be described as an independent standalone alarm unless the specific alarm system supports that functionality.

Key Features

  • 433MHz Wireless Communication – Sends detection signals to a compatible wireless alarm host.
  • Magnetic Opening Detection – Detects when the protected door, window or other opening is opened.
  • Wireless RF Transmission – No signal cable is required between the sensor and alarm panel.
  • 1527 Wireless Encoding – Uses the specified 1527 wireless encoding format.
  • 80m+ Open-Area Transmission – The supplied specification states a transmission distance of ≥80 metres in an open area.
  • Compact ABS Housing – Lightweight white ABS construction.
  • Low Power Consumption – Quiescent current is specified as less than 10µA.
  • Easy Installation – Designed for straightforward mounting on doors, windows, drawers and cabinets.
  • Wide Applications – Suitable for residential and commercial security installations.
  • Magnetic Detection Distance: 25–35mm according to the supplied specifications.
  • Low-Voltage Detection – Includes an undervoltage detection function.

Product Specifications

  • Model: MCJ-43
  • Product Type: 433MHz Wireless Door & Window Magnetic Sensor
  • Brand: NAVKAR SYSTEMS
  • Power Supply: DC 3V, Button Cell Battery
  • Communication: 433MHz Wireless RF
  • Operating Range: ≥80 meters in open area
  • Material: ABS
  • Dimensions: 70 × 40 × 20 mm
  • Other Specifications:
    • Wireless Encoding: 1527
    • Quiescent Current: <10µA
    • Working Current: ≤15mA
    • Magnetic Detection Distance: 25–35mm
    • Operating Temperature: -10°C to 40°C
    • Color: White
    • Quantity: 1 PC
    • Installation Gap: Keep sensor and magnetic contact properly aligned and within approximately 1cm when installed.
    • Application: Doors, windows, drawers, cabinets and other opening points
    • Alarm Connection: Sends an RF signal to a compatible alarm host when the magnetic contact separates.

Applications

  • Home Security – Monitor main doors, back doors, windows and other entry points.
  • Office Security – Monitor office doors, cabinets and restricted areas.
  • Shop & Store Security – Protect shop entrances, storage areas and display cabinets.
  • Factory Security – Monitor selected access points and doors.
  • School Security – Monitor doors and windows in classrooms and restricted areas.
  • Villa & Residential Security – Add wireless opening detection to a compatible alarm system.
  • Cabinet & Drawer Monitoring – Suitable for selected cabinets, drawers and other movable access points.

Suitable For

  • Suitable application / customer type: Homes, apartments, offices, shops, schools, factories, villas and other residential or commercial users requiring door/window opening detection.
  • Suitable environment: Indoor environments where a compatible 433MHz wireless alarm host/security system is available.
  • Suitable installation: Doors, windows, drawers, cabinets and other opening points where the sensor and magnetic contact can be properly aligned. The supplied specifications recommend keeping the two parts within approximately 1cm when installed.

Not Suitable For

  • Not suitable application: Standalone security operation without a compatible alarm host.
  • Important limitation: The MCJ-43 is a wireless sensor/accessory that sends an RF signal to an alarm host; it does not replace the main alarm control panel.
  • Environmental or technical limitation: The advertised 80m+ transmission range applies to open areas. Actual wireless range can be reduced by walls, metal structures, obstructions and other sources of RF interference. It is also specified for an operating temperature of -10°C to 40°C..

Package Contents

  • 1 × MCJ-43 Wireless Door/Window Sensor
  • 1 × Magnetic Contact
  • Battery / Mounting Accessories – as supplied with the specific packag.

Installation

Step 1 – Select the Installation Location

Choose the door, window, drawer or cabinet that you want to monitor.

Step 2 – Position the Main Sensor

Install the main MCJ-43 transmitter on the fixed portion of the door/window frame.

Step 3 – Position the Magnetic Contact

Install the separate magnetic contact on the moving portion of the door or window.

Step 4 – Align Both Parts

With the door or window closed, keep the transmitter and magnetic contact properly aligned and close together. The supplied instructions recommend keeping the two parts within approximately 1cm for installation.

Step 5 – Install the Battery

Insert the specified battery into the sensor, observing the correct polarity.

Step 6 – Test the Sensor

Open the protected door/window and check whether the sensor indicator activates and the connected alarm host receives the wireless signal.

Wiring

The MCJ-43 is a wireless sensor, so there is no conventional signal wiring between the sensor and alarm panel.

  • Power: DC 3V battery supply as specified
  • Input: Magnetic contact/opening detection
  • Output: 433MHz wireless RF transmission
  • Wired Connection to Alarm Panel: Not required
  • Encoding: 1527 wireless encoding

The sensor communicates wirelessly with the compatible alarm host rather than using a wired alarm input.

Programming / Pairing

The exact programming procedure depends on the alarm panel being used.

General Pairing Procedure

  1. Put the compatible 433MHz alarm host into its sensor-learning/pairing mode.
  2. Activate the MCJ-43 by separating the magnetic contact from the transmitter.
  3. Allow the alarm host to receive the wireless signal and register the sensor.
  4. Save the sensor in the desired alarm zone.
  5. Test the sensor by opening and closing the protected door/window.

Because different alarm panels use different learning procedures, the exact menu sequence should be taken from the alarm panel's manual.

Operation

1. Door/Window Closed

When the protected door or window is closed, the magnetic contact remains close to the MCJ-43 transmitter.

2. Door/Window Opened

When the door/window is opened, the magnetic contact separates from the transmitter.

3. Wireless Signal Sent

The MCJ-43 detects the separation and transmits a 433MHz RF signal using its 1527 encoding.

4. Alarm Host Responds

The compatible alarm host receives the signal and performs its programmed response, such as triggering an alarm or notification.

The basic operating principle—separation of the magnet and transmitter followed by RF transmission to the alarm host—is supported by the supplied product description and comparable 433MHz/1527 sensor documentation.

Troubleshooting

  • Problem: Alarm does not trigger when the door opens
  • Solution: Check that the transmitter and magnetic contact are correctly positioned and aligned. Make sure they separate sufficiently when the door/window is opened.
  • Problem: Alarm panel does not detect the sensor
  • Solution: Confirm that the alarm panel supports the sensor's 433MHz/1527 wireless format and that the MCJ-43 has been properly paired.
  • Problem: Sensor has no indication
  • Solution: Check the battery installation and polarity. If the low-voltage indication is active, replace the battery.
  • Problem: Wireless signal is unreliable
  • Solution: Reduce the distance between the sensor and alarm host and avoid excessive obstructions, particularly large metal structures.
  • Problem: False triggering
  • Solution: Check that the sensor and magnet are firmly mounted and properly aligned. Ensure that vibration or movement is not causing unintended separation.

Common Problems

  • Sensor Not Detecting Door Opening – Check alignment and magnetic-contact positioning.
  • Sensor Not Connecting to Alarm Panel – Verify 433MHz/1527 compatibility and repeat the pairing process.
  • Low Battery – Replace the battery with the correct specification.
  • Weak Wireless Signal – Reduce the distance or remove obstacles between the sensor and alarm host.
  • Incorrect Installation Gap – Keep the transmitter and magnetic contact properly aligned and within the recommended installation distance.

FAQs

Q: What is the MCJ-43?
A: The MCJ-43 is a 433MHz wireless magnetic door/window sensor designed to detect the opening of doors, windows, drawers, cabinets and other access points.

Q: Does the MCJ-43 work independently?
A: It is designed to send a wireless signal to a compatible alarm host and should be used as part of a compatible security alarm system.

Q: What wireless frequency does it use?
A: The specified transmission frequency is 433MHz.

Q: What is the wireless encoding format?
A: The supplied specification states 1527 encoding.

Q: What is its transmission range?
A: The supplied specification states 80 metres or more in an open area. Actual range may vary depending on walls, metal structures and other interference.

Q: What can it protect?
A: It can be used for doors, windows, drawers, cabinets and other suitable opening points.

Q: What is the sensor size?
A: The specified main sensor dimensions are approximately 70 × 40 × 20mm.

Q: Does it need wiring?
A: No. Communication with the compatible alarm host is wireless.

Q: How should the sensor and magnet be installed?
A: Mount one part on the fixed frame and the other on the moving door/window. Keep them properly aligned and close together when the opening is closed.

Q: Can it be used with any 433MHz alarm panel?
A: Not necessarily. The alarm panel should support the sensor's 433MHz/1527 format. Compatibility should be confirmed before installation.

Spare Parts

  • Replacement Magnetic Contact
  • Replacement Battery
  • Mounting Screws / Mounting Accessories

Warranty

Not Applicable.

Videos

  • [Installation Video]
  • [Programming Video]
  • [Product Demonstration Video]

Manuals

  • [User Manual]
  • [Installation Manual]

Downloads

  • [Datasheet]: NA
  • [Wiring Diagram]: NA
  • [Catalogue / Brochure]: NA
  • [Other Download]: NA

Customer Questions

Q: Is this a Wi-Fi sensor?
A: Despite some marketplace wording that may use the term "WiFi," the supplied technical specification identifies the MCJ-43's communication as 433MHz RF wireless. It should not be marketed as a direct Wi-Fi sensor unless a specific Wi-Fi gateway or version is included.

Q: Can I receive notifications directly on my mobile phone from the MCJ-43?
A: The MCJ-43 itself is an RF sensor. Mobile notifications, SMS or calls depend on the compatible alarm host/gateway connected to the sensor.

Q: Can I install it on a window?
A: Yes. The supplied application information specifically identifies doors and windows as intended installation locations.

Q: Can I use it on a cabinet or drawer?
A: Yes. The supplied description states that it can be used for drawers and cabinets as well as doors and windows.

Q: Does it have a built-in siren?
A: The MCJ-43 is described as a magnetic sensor that sends an RF signal to an alarm host. The alarm response is provided by the connected alarm system.

Q: What happens when the magnet separates from the sensor?
A: The sensor detects the separation and sends an RF signal to the compatible alarm host, which then performs its programmed alarm response.

Escalation to Support

If the issue cannot be resolved using the information above, Please contact Navkar Systems at Whatsapp Support number: 91384 68548 with the following information:

  • Product Model:
  • Purchase Date:
  • Problem Description:
  • Installation Details:
  • Photos / Videos:
  • Previous Troubleshooting Performed: