Motion & TH Sensor

Bringing Comfort in an Energy-Saving Way

CoWork Series
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  • Sensitive Motion Detection
  • Adjustable Detection Angles
  • High-Precision Temperature and Humidity Detection
  • High Data Integrity with Storage and Retransmission
  • Milesight D2D Communication
  • Ultra-Low Power Consumption
  • Easy Deployment and Installation

Elevate Comfort, Conserve Energy

Meet WS203, the wireless sensor that detects motion, temperature, and humidity. Paired with your HVAC system, it ensures your indoor environment stays comfortable, saving energy and maximizing comfort.


Ultimate Motion, Temperature
and Humidity Sensor

WS203 is a wireless environmental monitoring sensor detecting the motion of humans or animals, surrounding temp and humidity. It ensures the indoor environment at a preset comfort level via pairing with HVAC system if motions are being detected, which is a huge energy saver and brings much comfort.

Sensitive Motion Detection

WS203 can detect motions of humans or animals Sensitively at wide coverage up to 120° horizontal and 100° vertical within 6 meters based on passive infrared (PIR).

Adjustable Detection Angles

The detection range of the PIR sensor in WS203 could be adjusted via different standard PIR covers to adapt to various detection environments.

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Test Values in Optimal Detection Range

ws203 high precision th

High-Precision Temperature
and Humidity Detection

Built-in high-precision TH sensor ensures accurate monitoring of temperature and humidity in the air, detecting changes in real-time.

  • ws203 high precision temperature
  • Range: -20°C ~ +60°C
  • Accuracy: ±0.2°C
  • Resolution: 0.1°C
  • ws203 high precision humidity
  • Range: 0% ~ 100% RH
  • Accuracy: ±2% RH
  • Resolution: 0.5% RH

High Data Integrity with
Storage and Retransmission

WS203 can store up to 1000 sets of historical data records with time stamps. When the connection fails, WS203 will continue to collect and store environment data. Once reconnected, the data collected during that period will be retransmitted to the gateway, thus avoiding data loss.

Milesight D2D

Milesight D2D (Device to Device) communication protocol featuring LoRa® enables communication among different Milesight LoRaWAN® node devices without a LoRaWAN® gateway.

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

Ultra-Low Power Consumption

Based on the low power consumption LoRaWAN®, WS203 can maintain a long battery life of 5 years with a built-in 4000 mAh ER18505 Li-SOCL2 battery and report at a certain rate.

ws203 lorawan

LoRaWAN® Based

  • Penetrating Signals: data transmission range up to 2 km in urban areas and 15 km in rural areas
  • High Compatibility: compliant with standard LoRaWAN® gateways and network servers

Milesight Development Platform

Application Integration and Development

Milesight Development Platform simplifies device deployment and management and offers RESTful APIs for data interchange, webhooks to trigger external actions, centralized management of applications, and comprehensive documentation for crafting custom IoT solutions, helping system integrators and solution providers jump-start IoT projects.

Learn More
ws202 application

Cloud Data Management
Milesight IoT Cloud

  • Data Visualization Dashboard:
    All figures in a glance
  • Automatic Triggers:
    Interactive collaboration with Milesight IoT sensors
    to realize scene-based automation
  • Regular Reports & Real-Time Alerts:
    Data-based insights
  • Android & iOS App:
    Manage devices at your fingertips

Typical Application Scenarios

ws203 smart hospital

Smart Hospital

WS203 guarantees the health of patients by helping indoors temp and humidity control

ws203 smart office

Smart Office

WS203 ensures humans' wellness via coordinating with HVAC system when motions are detected.Smart Office

ws203 smart farm

Smart Farming

WS203 makes sure animals can live comfortably and get sick less through temp and humidity control

NFC Configuration

Switching On/Off & Configuring the Devices Wirelessly

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1st Step

Install the
Milesight ToolBox

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2nd Step

Enable NFC and run ToolBox,
then attach your phone to the device

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3rd Step

Verify the password
and start configuring

Explore More About NFC Configuration >>



3M Tape Mounting

ws203 installation

Wall Screw Mounting


Wireless Transmission
TechnologyLoRaWAN®, Milesight D2D
Tx Power16 dBm (868 MHz)/20 dBm (915 MHz)/19 dBm (470 MHz)
Sensitivity-137 dBm
ModeOTAA/ABP Class A
Detection Area120 ° Horizontal, 100 ° Vertical
Detection DistanceMaximum 6 m
Range-20°C ~ 60°C
Accuracy± 0.2°C
Range0% ~ 100% RH
Accuracy± 2% RH
Resolution0.5% RH
Button1 x Power/Reset Button (Internal)
LED Indicator1 × Status Indicator
ConfigurationNFC Configuration via Mobile App
Advanced FeatureMilesight D2D Controller, Data Storage, Data Retransmission
Physical Characteristics
Power Supply1 × 4000 mAh ER18505 Li-SOCl2 Battery
Battery Life*Up to 5 years (30 min Interval + 64 Triggers per Day, 25°C)
Operating Temperature-20°C to +60°C
Relative Humidity0 to 95% (Non-condensing)
Dimension73 x 73 x 26 mm ( 2.87 x 2.87 x 1.02in) (Without PIR Cover)
Ingress ProtectionIP30
Color & MaterialWhite + Grey, PC + ABS (Flame Retardant)
Installation3M Tape Mounting, Wall Screw Mounting

* Tested under laboratory conditions and for guideline purposes only.


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