Smart Fill Level Monitoring Sensor

Smart Toilet Paper Remaining Alert for Efficient Refilling

CoWork Series
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  • Suitable for Diverse Toilet Paper Dispenser
  • Accurate Fill Level Monitoring with ToF Technology
  • Up to 2 Years Battery Life with One Coin Cell Battery
  • Wireless Deployment and Easy Maintenance
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  • WS201

Streamline Refilling with Smart Monitoring

WS201 is a wireless sensor that utilizes ToF technology to monitor the fill level of containers with high accuracy. Working with Milesight LoRaWAN® gateway and Milesight IoT Cloud, WS201 allows users to remotely monitor and manage container fill levels and status in real-time.


Accurate Monitoring with
ToF Technology

WS201 utilizes advanced ToF (Time of Flight) technology for precise distance measurement, ensuring accurate detection of toilet paper fill levels. Additionally, it has a minimal blind zone of only 1 cm.

Flexible Paper Remaining

Optimize alerts and notifications for paper supply by implementing customizable threshold levels for greater flexibility.

Tailored Construction for

Ultra-thin body design effectively saves deployment space and adapts to various sizes of toilet paper dispensers.

Simplified Convenience
at Its Finest

1   DevEUI QR code on the front for quick scanning
2   Buckle-open lid design for easy maintenance

Versatile Applications

ws201 smart fill level monitoring sensor applacation
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Smart Restroom Solution

Good restroom experience always has a directly positive impact on occupants' perception of a building. To make it right and easy, Milesight Smart Restroom Solution provides IoT insights into the status of cleanliness and hygiene.

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Hibernate Mode

Schedule Hibernate Mode to align with scenarios such as mall closing and office hours ending.

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Ultra Low Power Consumption

The WS201 is powered by a long-lasting coin cell battery that can last up to 2 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
9 in 1 iaq sensor lorawan based

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

nfc configuration 1

1st Step

Install the
Milesight ToolBox

nfc configuration 2

2nd Step

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

nfc configuration 3

3rd Step

Verify the password
and start configuring

Explore More About NFC Configuration >>


3M Tape Mounting

ws201 smart fill level monitoring sensor flexible deployment


Wireless Transmission
Tx Power16 dBm (868 MHz)/22 dBm (915 MHz)/19 dBm (470 MHz)
ModeOTAA/ABP Class A
Distance Measurement
ToF FoV25 °
FoV Accuracy± 5 °
Detection Range1 ~ 55 cm
Detection Accuracy± 1cm
Detection Resolution①1mm (1.0≤X≤15.0cm)
②2mm (15.0<X≤35.0cm)
③3mm (35.0<X≤55.0cm)
X = Detection Distance
Button1 × Reset Button (Internal)
LED Indicator1 × Indicator (Internal)
ConfigurationMobile App (via NFC)
Physical Characteristics
Power Supply1 × 590mAh CR2450 Lithium Battery
Battery Life12 Years
Operating Temperature-10°C ~ +60°C
Relative Humidity0 ~ 95% (Non-condensing)
Color & MaterialWhite, ABS + PC (Flame Retardant)
Ingress ProtectionIP30
Dimension66 × 38 × 12 mm (2.60 × 1.50 × 0.47 in)
InstallationOn the flat surfaces with 3M tapes
Warranty22 Years

1 Tested under laboratory conditions and for guideline purposes only.
2 For detailed information, visit our website at


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