Milesight VS321 Wireless AI Occupancy Sensor
Featuring LoRaWAN®
Introduction
The VS321 is a low-power, battery-operated wireless occupancy sensor empowered by advanced AI algorithms. It achieves up to 95% occupancy detection accuracy powered by its AI algorithm. It is equipped with built-in temperature, humidity, and ambient light sensors to provide comprehensive environmental monitoring. Its wire-free design enables effortless and flexible installation.
With simple configuration and wireless detection, VS321 can be integrated with the Milesight LoRaWAN® gateway and Milesight Development Platform, enabling remote monitoring, data visualization, and centralized management. As a Milesight D2D controller, VS321 seamlessly communicates with other Milesight D2D devices, peer-to-peer interaction without gateway dependency.
VS321 can be used in scenarios such as meeting rooms, offices, and campuses to detect space occupancy or personnel activity.
Features
- Achieves up to 95% detection accuracy with advanced AI recognition and analysis technologies
- Adopts a low-power AI chip and PIR triggered detection, combined with scheduled hibernation, effectively reduces overall power consumption
- Supports switching between People Counting and Desk Occupancy modes to meet various needs across different scenarios
- Integrates temperature, humidity and light sensors to enable comprehensive environmental awareness and intelligent scenario-based control
- Wireless and battery-operated design ensures simple, fast and easy installation
- Stores local historical records and supports retransmission to prevent data loss
- Fully GDPR-compliant, with no image collection, ensuring privacy and data security
- Supports Milesight D2D protocol for ultra-low latency, direct device-to-device control without a gateway
- Fully compatible with standard LoRaWAN® gateways and network servers
- Supports remote monitoring and management via the Milesight Development Platform
Specifications
Measurement
People Counting & Occupancy Detection
| Parameter | Value |
|---|---|
| Field of View | 129° Horizontal, 93 ° Vertical |
| Installation Height | 2.4m ~ 4m |
| Required Illumination | 50 Lux |
| PIR Measuring Angle | 115° |
| PIR Detection Area | Radius: 4 m (15°C, 3m Installation Height) |
| Recognition Rate | Up to 95%1 |
Temperature
| Parameter | Value |
|---|---|
| Operating Principle | Digital CMOSens® technology (MEMS) |
| Measuring Range | -40 °C~125 °C |
| Accuracy | ±1 °C |
| Resolution | 0.1 °C |
Humidity
| Parameter | Value |
|---|---|
| Operating Principle | Digital CMOSens® technology (MEMS) |
| Measuring Range | 0~100 %RH |
| Accuracy | ± 2.5 %RH |
| Resolution | 0.5 %RH |
Light
| Parameter | Value |
|---|---|
| Operating Principle | Photodiode |
| Status | Bright/Dim |
Transmission
| Parameter | Value |
|---|---|
| Protocol | LoRaWAN®, Milesight D2D |
| Antenna | Internal Antenna |
| Frequency | CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4 |
| Tx Power | 16 dBm (868 MHz)/20 dBm (915 MHz)/19 dBm (470 MHz) |
| Sensitivity | -137 dBm @300bps |
| Work Mode | OTAA/ABP Class A |
Others
| Parameter | Value |
|---|---|
| USB | 1 × Type-C Port for Power Supply |
| LED Indicator | 1 × Status Indicator |
| Button | 1 × Multi-function Button |
Software
| Parameter | Value |
|---|---|
| Configuration | Bluetooth |
| Advanced Feature | Milesight D2D Controller, Data Storage (2045 entries), Data Retransmission, Data Retrievability, Threshold Alarm, Hibernate Mode |
Physical Characteristics
| Parameter | Value |
|---|---|
| Power Supply | 1) 4 × 2700 mAh ER14505 Li-SOCl2 Replaceable Batteries 2) DC 5V/1A by Type-C Port |
| Battery Life2 (Working 8h per day, 5-min detection and report interval, 25 °C) | Around 11.3 Years (SF7, EU868) Around 10.8 Years (SF7, US915) Around 7.5 Years (SF10, EU868 & US915) |
| Operating Temperature | 0 °C ~ +30 °C |
| Relative Humidity | 0 ~ 95% (Non-condensing) |
| Ingress Protection | IP30 |
| Housing&Color | Plastic (UL94, V2) & White/Black (Optional) |
| Weight | 145g (Batteries excluded) |
| Dimension | 100 x 100 x 26 mm (3.94 × 3.94 × 1.02 in) |
| Installation | Ceiling Mounting (Screws or Adhesive Backed Fixed) |
Approvals(Planned)
| Category | Approval |
|---|---|
| Regulatory | CE, FCC |
| Environmental | RoHS |
1 Tested within Optimal Detection Range.
2 Tested under laboratory conditions and for guideline purposes only.
Detection Range
To fully leverage the AI capabilities, it is recommended to follow the installation height guidelines below:
| Object | Height |
|---|---|
| Sedentary object | > 2.4 m |
| Standing object | > 3 m |
For accurate people counting, please refer to the following detection ranges corresponding to different installation heights:
| Installation Height (m) | Effective Detection Range (m²)* | Optimal Detection Range (m²)* |
|---|---|---|
| 2.4m | 2.6m × 5.0m | 1.4m × 3.0m |
| 2.5m | 2.3m × 5.2m | 1.6m × 3.6m |
| 2.6m | 2.6m × 5.6m | 1.8m × 4.0m |
| 2.7m | 2.8m × 6.1m | 2.0m × 4.3m |
| 2.8m | 3.1m × 6.3m | 2.1m × 4.6m |
| 2.9m | 3.4m × 6.8m | 2.3m × 5.0m |
| 3.0m | 4.0m × 7.2m | 2.3m × 5.0m |
| 3.1m | 4.0m × 7.6m | 2.7m × 5.7m |
| 3.2m | 4.1m × 8.0m | 2.9m × 6.0m |
| 3.3m | 4.4m × 8.4m | 3.0m × 6.4m |
| 3.4m | 4.7m × 8.7m | 3.3m × 6.7m |
| 3.5m | 5.0m × 9.0m | 3.3m × 7.4m |
| 3.6m | 5.2m × 9.5m | 3.0m × 7.5m |
| 3.7m | 5.5m × 9.8m | 3.8m × 7.8m |
| 3.8m | 5.7m × 10.2m | 4.0m × 8.1m |
| 3.9m | 6.0m × 10.6m | 4.2m × 8.4m |
| 4.0m | 6.0m × 11.0m | 4.6m × 8.7m |
* The effective and optimal detection range may differ with the height of the person being detected.
