Milesight - GS301
Bathroom Odour Detector

The Milesight GS301 Bathroom Odour Detector is a four-in-one odour detector, integrated to sense ammonia (NH3), hydrogen sulphide (H2S), temperature and humidity to expand IoT technology into traditional restrooms. With its compact size, this odour detector is easy to install and maintain. The GS301 bathroom odour detector is commonly used to monitor public and office restrooms as well as sensing urinal and sewer pipes.

Alarm triggering from the GS301 includes LED lights and a buzzer to indicate changes in thresholds. This notifies anyone nearby that the concentration levels of NH3 or H2S gas are beyond acceptable levels. These alarms are a key component to creating a smart bathroom solution. The GS301 can send sensor data and alarms remotely using LoRaWAN. Users can view and monitor the sensor data through IoT Cloud software or through Milesight LoRaWAN gateways.

Built-in replaceable batteries decrease installation costs with a 3 year battery life. Power on/off and configure the bathroom detector via NFC technology from a mobile phone or PC. The Milesight D2D (Device to Device) protocol using LoRaWAN enables communication with standard gateways at a 2km communication range.


  • Multiple sensors for highly-accurate gas detection, temperature and humidity
  • Damp proof interior coating to guarantee operation within variating conditions
  • LED indicator and buzzer alarms
  • Equipped with NFC for easy configuration
  • Compliant with standard LoRaWAN gateways and network servers


Physical Characteristics
Dimensions120 mm x 85 mm x 32.5 mm
InstallationWall mount
Environmental Characteristics
Operating Temperature-40C to +55C
Relative Humidity0% to 95% (non-condensing)
Ingress ProtectionIP30
Battery4 x 4000 mAh ER18505 Li-SOCl2 Replaceable Batteries
Battery LifeAround 3 years
Power On/OffNFC with mobile app or power button
Ammonia Sensor Characteristics
Range0 ~ `0 ppm
Accuracy+/- 5% (-40 - 35C)
Resolution0.01 ppm
Hydrogen Sulphide Sensor Characteristics
Range0 ~ 5 ppm
Accuracy+/- 5% (-40 - 35C)
Resolution0.01 ppm
Temperature Sensor Characteristics
Range-40C to + 86C
Accuracy+/- 0.2C
Humidity Sensor Characteristics
Range0 - 100% RH
Accuracy+/- 2%
Resolution0.5% RH
Wireless Characteristics
Tx Power16dBm (868) / 19dBm (470) / 22dBm (915)
ModeOTAA/ABP Class A
Configuration Interface
NFCPower On/Off, configure with mobile app
LED & Buzzer1 Status/Alarm Indicator + 1 Buzzer

Ordering Information and Pricing
Part Number Model Number Description RRP
[A] Milesight GS301 LoRaWAN Bathroom Odour Detector
GS301-915M GS301 LoRaWAN Bathroom Odor Detector $770.00 C3