Milesight WS303 LoRaWAN® Mini Leak Detection Sensor (EU868)

Milesight WS303 LoRaWAN® Mini Leak Detection Sensor (EU868)

• Immediate Warning Locally and Remotely
• Unique Milesight D2D Communication
• Up to 5 Years Battery Life with One Coin Cell Battery
• Robust IP67 Waterproof Protection

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€61,00 €67,00
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Product Description

The Milesight WS303 Mini Leak Detection Sensor is an innovative solution designed for detecting water leaks in various settings, such as smart offices, buildings, and houses. This sensor is part of the CoWork Series, and it plays a crucial role in preventing water damage by providing immediate local and remote warnings when leakage occurs.

The WS303 operates on the principle of water conductivity, detecting the presence of conductive liquids with a minimum level of just 0.5mm. This sensitivity allows for the early detection of leaks, helping to mitigate potential damage. The sensor is equipped with gold-plated probes and stainless steel screws to prevent corrosion, making it durable and long-lasting.

One of the standout features of the WS303 is its unique Milesight D2D (Device to Device) communication protocol, which uses LoRa® technology. This feature enables the sensor to communicate with other Milesight LoRaWAN® node devices without a LoRaWAN® gateway, resulting in lower latency, faster response times, and secure transmissions. This capability is particularly beneficial in applications where rapid response to water leaks is critical.

The WS303 is also noted for its robust protection, boasting an IP67 waterproof rating, making it suitable for use in a variety of environments. It's powered by a long-lasting coin cell battery, providing up to five years of operation. This low power consumption ensures that the sensor can be deployed with minimal maintenance.

Key Features

  • Leakage Detection: Detects conductive liquids with a minimum level of 0.5mm.
  • Milesight D2D Communication: Utilizes LoRa® technology for efficient communication among LoRaWAN® node devices.
  • Long Battery Life: Powered by a 590mAh CR2450 lithium battery, lasting up to 5 years.
  • Robust Protection: Features gold-plated probes and an IP67-rated enclosure for durability.
  • Immediate Warning System: Alerts both locally and remotely upon water leakage detection.
  • Flexible Installation: Compact design allows easy surface or wall mounting without wiring.
  • Low Power Consumption: Ensures extended operation and reduces maintenance needs.
  • LoRaWAN® Based: Supports data transmission over long distances and is compatible with standard LoRaWAN® gateways and network servers.
  • NFC Configuration: Allows easy device configuration and management via mobile app.
  • Cloud Data Management: Compatible with the Milesight IoT Cloud for data visualization and management.

The WS303 Mini Leak Detection Sensor is an essential component for smart water leak management, offering advanced technology, ease of installation, and longevity, making it a reliable choice for diverse applications​.

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Wireless Transmission
Technology LoRaWAN®, Milesight D2D
Frequency CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
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

Shipping Policy

We provide worldwide shipping using reliable tracked
shipping services.

Local Shipments within Cyprus

Shipments in Cyprus are performed usually with ACS Courrier
or AKIS Express. In some cases, we might deliver the products ourselves. A pick-up
option from our locations is also available.

International Shipments

International shipments are performed using Express Airway
Shipping Services. We are currently shipping orders with TNT Express and FedEX.
As soon as your shipment is dispatched you will receive the shipment confirmation
including the shipment tracking number which you can use to track your order
from the shipment provider website.

We dispatch orders within 1-3 workdays after the day of the
order placement. 

General Return Policy

We have a 30-day return policy, which means you have 30 days
after receiving your item to request a return.

To be eligible for a return, your item must be in the same
condition that you received it, unworn or unused, with tags, and in its
original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at If
your return is accepted, we’ll send you a return shipping label, as well as
instructions on how and where to send your package. Items sent back to us
without first requesting a return will not be accepted.

For any further information, help and support regarding the
shipping and/or return process you can contact us at:

  • Email:
  • Telephone: +357 22 282828