Alarming for Unauthorized Entry

The EM300-MCS magnetic contact switch can be mounted to any door or window to detect an opening or closing event. It adds physical security monitoring to your location by alarming for intrusion or unauthorized entry to your monitored conditions.

Temperature & Humidity Monitoring

spot-30°C to 70°C

spot0% to 100% RH

EM300-MCS built-in Sensirion industrial-grade digital sensor, providing ±0.3℃
high accuracy of temperature and ±3% RH of humidity


1EM300-MCS compatible with industry-standard LoRaWAN® gateways

2With a range of up to 15 km in rural areas and 2 km in urban areas

EM300-MCS magnetic contact switch

IP67 Waterproof

Equipped with IP67 rated enclosure to fit into more application scenarios

Dustproof and waterproof
industrial grade design

EM300-MCS magnetic contact switch

Ultra Low Power Consumption

Easily replaceable battery with up to 10 years service life

spotER18505 4000 mAh Li-SOCl2 Battery

spotDual Battery Holders (One Battery by Default)

EM300-MCS magnetic contact switch

Easy to Use

Switching on/off and configuring the device via NFC technology from mobile phone or PC

step-11st Step
Install the Milesight ToolBox (Android/iOS).

step-22nd Step
Enable NFC and run ToolBox,
attach your phone to the device.

step-33rd Step
Verify the password and start configuring.


Milesight IoT Cloud

spotMonitoring door/window status to alarm unauthorized entry

spotRemote monitoring of temperature and humidity with a phone

spotInteractive collaboration with a variety of Milesight sensors

spotAndroid & iOS versions allow you to manage devices at your fingertips


It can be applied to various scenes of anti-location.

EM300-MCS magnetic contact switch application


LoRaWAN® Frequency CN470/RU864/IN865/EU868/US915/AU915/KR920/AS923
Tx Power 17dBm (470) / 16dBm (868) / 20dBm (915)
Sensitivity -147dBm @300bps
Mode OTAA/ABP Class A
Sensing Lead Cable 1007UL #22AWG 260mm
Type Normally closed
Distance of magnets 20-30mm
Distance of holes 22mm
Temperature Measuring Range -30°C to +70°C
Accuracy 0 ~ 70°C: ±0.3°C
-30 ~ 0°C: ±0.6°C
Resolution 0.1°C
Humidity Measuring Range 0%~100% RH
Accuracy ±3%(10~90%RH)
±5%(Other ranges)
Resolution 0.10%
Physical Characteristics Power Supply 18505 Li-SOCL12 4000mA ( 8000mA optional)
Battery Life ≧ 5 years ( for 1 battery)
Operating Temperature -40°C to 70°C
Ingress Protection IP67
Dimension 88 × 87 × 27 mm
Mounting Wall (screws or 3M adhesives)

em300-mcs magenectic contact switch


Temperature & Humidity Sensor

em300-mcs magenectic contact switch


Leak Detection Sensor

    Country CodeBusiness Type


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