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    Monnit Wireless Open/Closed Sensor — Technical Specifications

    September 08, 2026 3 min read

    Technical overview for the Monnit Wireless Open/Closed Sensor.

    💾 Download Original PDF
    Full text manual (for reference)

    Technical overview for the Monnit Wireless Open/Closed Sensor — a magnetic switch sensor that detects when a door or window is opened or closed, reporting to the free iMonnit online monitoring system.

    General Description

    The Wireless Open/Closed Sensor uses an external magnetic switch to detect when a door or window is opened and closed. When the sensor detects that the magnet is removed or returned, it sends the information to the iMonnit Online Sensor Monitoring and Notification System, where data is stored and can be reviewed or exported as a data sheet or graph. Notifications can be set up to alert the user when the magnetic source is present or not — with the ability to notify only within specific times of day.

    Features

    • Detects when a door or window is accessed
    • Magnet included
    • Free iMonnit basic online wireless sensor monitoring and notification system — configure sensors, view data, and set SMS/email alerts

    Power Options

    Sensors are powered by a replaceable 3.0V coin cell battery. Optional AA-battery-powered sensors are available in a larger housing (3" L x 2.1" W x 1.2" H) with two long-life AA batteries. Unless using the AA option, set the heartbeat to no faster than one hour to preserve battery life.

    Example Applications

    • Doors and windows
    • Cabinets and lockers
    • IT server closets
    • Freezer and cooler doors

    Monnit Sensors Core Specifications

    Spec Detail
    Power Replaceable 3.0V coin cell battery
    Communication RF 900, 868, and 433 MHz
    Dimensions 1.775" x 1.040" x 0.785"
    Sensor Leads 15 inch
    Antenna 4" wire antenna
    Operating Temperature -7° to 60°C (20° to 140°F)
    Device Range 250-300 ft. non-line-of-sight*
    Battery Life ~1-2 years at 1-hour heartbeat setting**

    * Actual range may vary depending on environment. ** Battery life is determined by sensor reporting frequency and other variables.

    Technical Specifications — Electronics

    Parameter Value
    Supply Voltage (Battery Power) 2.0 - 3.6 VDC*
    Current Consumption 0.7 µA (sleep) / 2 mA (radio idle/off, measurement) / 25 mA (radio RX) / 35 mA (radio TX)
    Operating Temperature Range -7°C to +60°C (20°F to +140°F)**
    Optimal Battery Temperature Range +10°C to +50°C (+50°F to +122°F)

    Technical Specifications — Magnetic Switch

    Parameter Value
    Contact Type SPST, gold under-plating with deactivated Rhodium outer-plating
    Switch Cycles 50 million
    Operation Gap Up to 3/4 inch
    Wire Leads 22 gauge / 15 inch length
    Magnet Alnico
    Magnet Case Construction Weatherproof, high-impact ABS plastic with self-adhesive backing
    Magnet Temperature Range -15°F to 160°F (-25°C to 70°C)

    * Hardware cannot withstand negative voltage; take care when connecting a power device. ** At temperatures above 100°C, board circuitry may lose programmed memory.

    Caution / Notice

    This product is designed for use in an ordinary environment (normal room temperature, humidity, and atmospheric pressure). Do not use under the following conditions, as they can deteriorate product characteristics and cause failure or burn-out:

    • Corrosive or deoxidizing gas (chlorine, hydrogen sulfide, ammonia, sulfuric acid, nitric oxide gases, etc.)
    • Volatile or flammable gas
    • Dusty conditions
    • Low or high pressure
    • Wet or excessively humid locations
    • Salt water, oils, chemical liquids, or organic solvents
    • Excessively strong vibrations
    • Other similarly hazardous conditions

    Use within the specified temperature range — higher temperatures may deteriorate the product's characteristics or material quality.

    Manufacturer Contact

    Monnit Corporation
    7304 South Cottonwood, Suite #204
    Midvale, Utah 84047
    801-561-5555
    www.monnit.com

    Document MD-008-2A (6/13). Monnit, the Monnit logo, and iMonnit are trademarks of Monnit Corp. ©2013 Monnit Corp. All Rights Reserved.