WS303 Mini Leak Detection Sensor

Stop Leaks, Avoid Further Damage

CoWork Series
ws303 mini leak detection sensor 1 small
ws303 mini leak detection sensor 2 small
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  • Immediate Warning Locally and Remotely
  • Unique Milesight D2D Communication
  • Up to 5 Years Battery Life with One Coin Cell Battery
  • Robust IP67 Waterproof Protection
  • Home
  • IoT LoRaWAN® Series
  • WS303

Smart Water Leak Detection Solution

Introducing the WS303, a 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 leak, water spillage, or floor wetness occurs.

Sensitivity That Exceeds

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

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
Learn More

Smart Restroom Solution

To make it right and easy, Milesight Smart Restroom Solution provides IoT insights into the status of cleanliness and hygiene.

Get More Details

Power Failure Alarm

WS303 includes capacitor storage to trigger a power failure alarm.

Ensuring Device Safety with Robust Protection

  • Utilizes gold-plated probes and stainless steel screws to prevent corrosion.
  • Equipped with IP67-rated enclosure to fit into more application scenarios.
ws303 mini leak detection sensor anti corrosion
ws303 mini leak detection sensor ip67

Flexible and Effortless

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

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

NFC Configuration

Switching On/Off & Configuring the Devices Wirelessly

ws303 mini leak detection sensor nfc configuration 1

1st Step

Install the
Milesight ToolBox

ws303 mini leak detection sensor nfc configuration 2

2nd Step

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

ws303 mini leak detection sensor nfc configuration 3

3rd Step

Verify the password
and start configuring

Explore More About NFC Configuration >>


ws303 mini leak detection sensor installation 1

Fixed by 3M Tape

ws303 mini leak detection sensor installation 2

Placement Installation


Wireless Transmission
TechnologyLoRaWAN®, Milesight D2D
Tx Power16dBm(868 MHz)/20dBm(915 MHz)/19dBm(470 MHz)
Sensitivity-137dBm @300bps
ModeOTAA/ABP Class A
Leakage Detection
Liquid TypeConductive Liquid
Trigger ConditionOnce Liquid Level Reaches 0.5mm
ConfigurationNFC Configuration via Mobile App
Advanced FeatureMilesight D2D Controller
Physical Characteristics
Power Supply1 × 590mAh CR2450 Lithium Battery
Battery Life*5 years (One hour leakage per week, 25°C)
Operating Temperature-10°C to +60°C
Relative Humidity0% to 100% (Non-condensing)
Ingress ProtectionIP67
Dimension63 × 63 × 14 mm
Material & ColorABS+PC, White
Installation3M Tape Mounting, Desktop

* Tested under laboratory conditions and for guideline purposes only.


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