Milesight EM300-MCS Magnetic Switch Sensor

The Milesight EM300-MCS is a compact magnet switch sensor for detecting open/close status of objects (such as doors or windows)and transmitting alarm, using LoRaWAN technology. With this low power consumption technology, EM300-MCS can work upto 5 years with it's 4000 mAh battery. Combined with a LoRaWAN gateway and IoT Cloud solution, users can manage all sensor data and remotely receive alarms.

The EM300-MCS sensor also integrates temperature and humidity sensors, providing greater utility for use in applications such as home and office automation, factories monitoring and more.


  • High sensitivity with door and window security detection
  • Embedded with temperature and humidity sensors for environment monitoring
  • IP67 UV-resistant and waterproof enclosure for harsh environment applications
  • Replaceable 4000 mAh battery built-in, for upto 5 years of operation, with the option of a second battery
  • Equipped with NFC for easy configuration
  • Compliant with standard LoRaWAN gateways and network servers


Physical Characteristics
DimensionsTransceiver: 105.6 mm (h) x 85.3 mm (w) x 27 mm (d)
Magnet: 32 mm x 15 mm x 8mm on a 1.5m cable
InstallationWall Mounting
Environmental Characteristics
Operating Temperature-30C to +70C
Relative Humidity0% to 100% (non-condensing)
Ingress ProtectionIP67
Battery4000 mAh ER18505 Li-SOCL2 Battery (extendable to 2 batteries)
Battery LifeUpto 10 years (2 Batteries, at a 10 minute read interval and with 48 triggers/day)
Power On/OffNFC with APP, or Internal Power Button
Sensor Characteristics
Door Magnet20-30mm Detection Distance
TemperatureRange: -30C to + 70C
Accuracy: 0C to + 70C (+/- 0.3C), -30C to 0C (+/- 0.6C)
Resolution: 0.1C
HumidityRange: 0% to 100% RH
Accuracy: 10% to 90% RH (+/- 3%), below 10% and above 90% RH (+/- 5%)
Resolution: 0.5% RH
Wireless Characteristics
Tx Power16dBm(868)/20dBm(915)/19dBm(470)
Sensitivity-137dBm @300bps
ModeOTAA/ABP Class A
Configuration Interface
NFCPower On/Off, configure with Mobile App
RegulatoryCE, FCC, RoHS, LoRaWAN Certified
Ordering Information and Pricing
Part Number Model Number Description RRP
[A] Milesight EM300-MCS Magnetic Switch Sensor
EM300-MCS-915M EM300-MCS LoRaWAN Environmental Monitoring, Magnetic Contacty Switch, NFC, 1.5m Cable, IP67 $143.00 C3