Milesight WS303 LoRaWAN Mini Leak Detection Sensor


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  • Free Shipping Total Purchase > RM150
  • Cash Back 1% of Total Purchase
  • 30 Days Return Policy
  • 1 Year Warranty
  • Refund Policy
  • Immediate Warning Locally and Remotely
  • Unique Milesight D2D Communication
  • Up to 5 Years Battery Life with One Coin Cell Battery
  • Robust IP67 Waterproof Protection
SKU: MYP-MSG-078 Categories: ,

WS303 is a tiny and mighty leakage detection sensor for detecting presence of water leaks and transmitting an alarm using LoRaWAN® technology. With this low power consumption technology, WS303canwork up to 5 years with a 590mAh battery. Compliant with Milesight D2D protocol, it can directly link with other Milesight devices to realize danger prevention and effectively prevent unnecessary loss.

The wire-free WS303 can be easily used in smart offices, buildings, and houses. Users can receive real-time alarms via a built-in buzzer locally and a mobile App remotely. Combining with Milesight LoRaWAN® gateway and Milesight IoT Cloud, users can manage all sensor data remotely and visually

Main Features

  • Detect the presence of conductive liquids using a small water probe
  • A replaceable built-in 590mAh battery with up to 5 years of life for wire-free power supply
  • IP67 waterproof enclosure for harsh environment applications
  • Embedded with a buzzer for real-time alarming
  • Support Milesight D2D protocol to enable ultra-low latency and direct control without gateways
  • Equipped with NFC for easy configuration
  • Compliant with standard LoRaWAN® gateways and network servers
  • Quick and easy management with Milesight IoT Cloud solution

Smart Water Leak Detection Solution

Introducing WS303, the mini water leak detection sensor That detects the presence of leaks and raises alarms locally and remotely. With low power consumption, it can operate for 5 years on a single battery. It’s ideal for smart offices, buildings, houses, etc.


Immediate Warning Against Water Damage

WS303 will sound an alarm and send a remote alert when water leakage occurs.


Sensitivity That Exceeds Expectations

The WS303 sensor uses water conductivity to detect a minimum water level of 0.5 mm by forming a circuit with two little metal probes. (Other conductive liquids are also supported.)



Milesight D2D Communication

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

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



Power Failure Alarm

WS303 includes capacitor storage to trigger a power failure alarm.



Ensuring Device Safety with IP67 Waterproof

Equipped with IP67-rated enclosure to fit into more application scenarios.


Flexible and Effortless Installation

The compact design makes it easy to mount on a surface or wall as needed without wiring.



Ultra Low Power Consumption

The WS303 is powered by a long-lasting coin cell battery that can last up to 5 years. This ensures uninterrupted usage and eliminates the need for frequent battery replacements.

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



NFC Configuration

Switching On/Off & Configuring the Devices Wirelessly






Wireless Transmission
Technology LoRaWAN®, Milesight D2D
Frequency AS923
Tx Power 16dBm(868 MHz)/20dBm(915 MHz)/19dBm(470 MHz)
Sensitivity -137dBm @300bps
Mode OTAA/ABP Class A
Leakage Detection
Liquid Type Conductive Liquid
Trigger Condition Once Liquid Level Reaches 0.5mm
Buzzer Support
Configuration NFC Configuration via Mobile App
Advanced Feature Milesight D2D Controller
Physical Characteristics
Power Supply 1 × 590mAh CR2450 Lithium Battery
Battery Life* 5 years (One hour leakage per week, 25°C)
Operating Temperature -10°C to +60°C
Relative Humidity 0% to 100% (Non-condensing)
Ingress Protection IP67
Dimension 63 × 63 × 14 mm
Material & Color ABS+PC, White
Installation 3M Tape Mounting, Desktop

* Tested under laboratory conditions and for guideline purposes only.


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