Milesight GS301 LoRaWAN Bathroom Odor Detector


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  • 30 Days Return Policy
  • 1 Year Warranty
  • Refund Policy
  • Detect NH3 & H2S with Higher Accuracy
  • Wireless Deployment with up to 3 Years Battery Life
  • Support LoRaWAN® & Milesight D2D Simultaneously
  • Built-in Buzzer & Traffic Light Indicator for Alarming

GS301 is a 4-in-1 LoRaWAN® bathroom odor detector to detect ammonia (NH3) and hydrogen sulfide (H2S) gas according to electrochemical principle. GS301 is also able to detect temperature and humidity to fully aware of the environment of bathrooms. When the NH3 or H2S gas concentration reaches the preset threshold, the detect or will trigger both LED light alarm and buzzer to notify people timely to ventilate, which is an important part in smart bathroom solution.

Apart from local alarms, GS301 can also report the sensor data and alarm messages remotely by the use of LoRaWAN® technology. Integrating with Milesight LoRaWAN® gateway and Milesight IoT Cloud solution, users can monitor all the sensor data and control the device remotely and flexibly. Moreover, GS301 supports Milesight D2D to enable ultra-low latency control without gateways.

Main Features

  • Built-in high accuracy electrochemical gas detection sensor with more than 3-year-long life expectancy
  • Built-in multiple sensors including NH3, H2S, temperature and humidity
  • Built-in batteries to achieve wireless power supply and decrease the installation cost
  • Equipped with buzzer and LED indicator to indicate threshold alarms
  • Damp proof coating inside the device to ensure device working well on various conditions of bathrooms
  • Support Milesight D2D protocol to enable ultra-low latency and direct ventilation control without gateways
  • Built-in NFC for easy configuration
  • Compatible with standard LoRaWAN® gateways and network servers
  • Quick and easy management with Milesight IoT Cloud solution

Cleaner Bathroom Start with Odor Sensing

Minimalist & Practical Design

GS301 LoRaWAN® Bathroom Odor Detector is compact in size and easy to install and maintain. With damp proof coating, the detector can work on various conditions of bathrooms.

4-in-1 Sensors with High-Sensitivity

Integrated with ammonia (NH3), hydrogen sulfide (H2S), temperature and humidity sensors.
Detect ammonia (NH3) and hydrogen sulfide (H2S) gas according to electrochemical principle.

  • NH3: ±5% Accuracy
  • H2S: ±5% Accuracy

* It is highly recommended that sensors operate below 35°C.



Stay Informed of Foul Air

When ammonia or hydrogen sulfide concentration reaches thresholds, the alarm will be activated, including traffic lights indicator, built-in buzzer and uplink data packets. *Thresholds can be customized

Assistant to Ventilator for Clearer Air

HVAC system is empowered to automatically adjust based on the detected concentrations of ammonia and hydrogen sulfide produced from the urinal and sewer pipe.


Milesight D2D Featuring LoRa®

Support Milesight D2D protocol to enable ultra-low latency and direct ventilation control without gateways.

  • Lower Latency
  • Less than 1 Second Response Time
  • Secure Transmission
  • Reduce Investment Cost

*When Milesight D2D is enabled, LoRaWAN® protocol can operate as usual.


Multi-Year Battery Operation

GS301 has a battery life of up to 3 years

* Sensor Life can be over 3 Years
**4 x 4000mAh ER18505 Li-SOCl2 Replaceable Batteries (10 min intervals)



LoRaWAN® Based

  • Compatible with Standard LoRaWAN® Gateway
  • Penetrate Thick Wall
  • 2 km Communication Range in Urban Areas

Easy Configuration

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

Flexible Installation



Wireless Transmission Protocol LoRaWAN® , Milesight D2D
Frequency AS923-1&2&3&4
Tx Power 16 dBm (868 MHz)/19 dBm (470 MHz)/22 dBm (915 MHz)
Sensitivity -137dBm
Mode OTAA/ABP Class A
Ammonia (NH3) Detection Principle Solid Polymer Electrochemical
Range 0 ~ 10 ppm
Accuracy ± 5% (-40 – 35°C)
Long-term Stability < 1 % accuracy drift per month
Resolution 0.01 ppm
Hydrogen Sulfide (H2S) Detection Principle Solid Polymer Electrochemical
Range 0 ~ 5 ppm
Accuracy ± 5% (-40 – 35°C)
Long-term Stability < 1 % accuracy drift per month
Resolution 0.01 ppm
Temperature Range -40 – 85°C
Accuracy ± 0.2°C
Resolution 0.01°C
Humidity Range 0 – 100%RH
Accuracy ± 2%
Resolution 0.5%RH
Others LED& Buzzer 1 × Status/Alarm Indicator + 1 × Buzzer
Button 1 × Reset/Reboot Button
Configuration Mobile App via NFC
Advanced Feature Milesight D2D Controller
Physical Characteristics Power Supply 4 x 4000 mAh ER18505 Li-SOCl2 Replaceable Batteries
Sensor Life > 3 Years
Battery Life Around 3 Years (10 min interval)
Operating Temperature -40°C – 55°C
Relative Humidity 0% – 95% (non-condensing)
Ingress Protection IP30
Dimension 120 × 85 × 32.5 mm (4.72 × 3.35 × 1.28 in)
Material & Color PC+ABS (Flame Retardant), White
Installation Wall Mounting



Additional information
Weight 0.4 kg
Dimensions 19 × 12 × 6 cm
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