EM300-MCS Magnetic Contact Switch
EM300-MCS Magnetic Contact Switch
EM300-MCS Magnetic Contact Switch
EM300-MCS Magnetic Contact Switch

EM300-MCS Magnetic Contact Switch


Regular price $128.00
Shipping calculated at checkout.

Magnetic Contact Switch
  • Security Alarm for Door Opening
  • IP67 Waterproof
  • LoRaWAN® Wireless
  • 5/10 Years Battery Life
  • NFC for Configuring

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

  • -30°C to 70°C
  • 0% to 100% RH

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


  1. EM300-MCS compatible with industry-standard LoRaWAN® gateways
  2. With a range of up to 15 km in rural areas and 2 km in urban areas

IP67 Waterproof

Equipped with IP67 rated enclosure to fit into more application scenarios
Dustproof and Waterproof
Industrial Grade Design



Ultra Low Power Consumption

Easily replaceable battery with up to 10 years service life

  • ER18505 4000 mAh Li-SOCl2 Battery
  • Dual Battery Holders (One Battery by Default)


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

1st Step
Install the Milesight ToolBox (Android/iOS).

2st Step
Enable NFC and run ToolBox,
attach your phone to the device.

3st Step
Verify the password and start configuring.

Milesight IoT Cloud

  • Monitoring door/window status to alarm unauthorized entry
  • Remote monitoring of temperature and humidity with a phone
  • Collaborative interaction with a variety of Milesight sensors
  • Android & iOS versions allow you to manage devices at your fingertips


EM300-MCS Magnetic Contact Switch


LoRaWAN® Frequency CN470/RU864/IN865/EU868/US915/AU915/KR920/AS923
Tx Power 17dBm (470) / 16dBm (868) / 20dBm (915)
Sensitivity -137dBm @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 ER18505 Li-SOCl2 4000 mAh (8000 mAh 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)