AI occupancy sensor (white / black)
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Product code: VS321-868M PN: White / Black
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Milesight VS321-868M is a wireless space occupancy sensor using PIR, an RGB camera and local AI algorithms. The device supports People Counting and Desk Occupancy, achieving detection accuracy of up to 95%. Analysis is performed locally, without storing images, ensuring a high level of user privacy.
VS321-868M communicates via LoRaWAN EU868 and Milesight D2D, and additionally measures temperature, humidity and Bright/Dim light status. Power from 4 × ER14505 Li-SOCl₂ batteries enables approximately 11.3 years of operation at SF7 under the manufacturer's test conditions. Two color variants are available: white and black.
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VS321 — intelligent AI-based space utilization analysis
Milesight VS321-868M is a wireless, battery-powered occupancy sensor using PIR, an RGB camera and local AI algorithms to analyze presence and the number of people in a monitored space.
The device supports two primary operating scenarios: People Counting for determining the number of people in a defined area and Desk Occupancy for monitoring workstation occupancy.
VS321 does not store user images. Analysis is performed locally, and only detection results and measurement data are transmitted to the supervisory system. This makes it possible to use AI while preserving the privacy of people in the room.
AI, up to 95% accuracy and over 10 years of battery operation
Do 95%
Local AI algorithms provide high occupancy detection accuracy within the optimal detection area.
2 AI modes
People Counting and Desk Occupancy allow the operating mode to be adapted to the type of space.
Up to 11.3 years
Four replaceable Li-SOCl₂ batteries provide many years of autonomous operation without cabling.
Smart Office and space utilization optimization
PIR, RGB and local image analysis
VS321 combines a PIR sensor, an RGB module and an energy-efficient AI processor.
PIR can detect activity and trigger analysis, so the camera and AI algorithm do not need to operate continuously. This reduces power consumption and extends device operating time.
Analysis is performed locally. The device does not store or transmit user photos, and detection results are sent to the system as data.
Regional people counting indoors
In People Counting mode, VS321 can determine the number of people within the monitored area.
The data can be used to analyze the utilization of conference rooms, office spaces and other shared areas.
Workstation occupancy monitoring
The second mode is designed to analyze desk and workstation occupancy.
Milesight recommends a single VS321, among other uses, for monitoring groups of approximately 4–8 workstations in offices, libraries and study rooms.
Desk utilization data can support hot-desking systems, space planning and analysis of actual workstation demand.
Wide 129° × 93° field of view
Up to 4 × 7.2 m effective area at a height of 3 m
The size of the detection area depends on the mounting height. At an installation height of 3 m, the manufacturer specifies an effective area of approximately 4.0 × 7.2 m.
At the same height, the optimal area providing the highest detection accuracy is approximately 2.3 × 5.0 m.
Additional motion sensor for energy-efficient operation
* At 15°C and a mounting height of 3 m.
Additional environmental condition monitoring
The sensor range does not represent the operating temperature range of the complete device. VS321 is designed to operate at temperatures from 0 to +30°C.
Relative humidity measurement 0–100% RH
Bright / Dim status information
The built-in photodiode determines room lighting status as Bright or Dim.
Presence and lighting data can then be used in automatic lighting or HVAC control scenarios.
Direct device control without a gateway
VS321 can operate as a Milesight D2D Controller.
This allows events to be sent directly to compatible devices and local automation scenarios to be implemented with very low latency, without a LoRaWAN server intermediary.
Wireless data transmission to the central system
The VS321-868M version operates in the European EU868 band and is compatible with standard LoRaWAN gateways and network servers.
The device uses LoRaWAN Class A and supports OTAA and ABP activation.
Memory for 2045 entries and retransmission
2045 entries
Historical data can be stored locally in the device memory.
Retransmission
The retransmission function helps reduce data loss during network issues.
Retrievability
Stored data can be retrieved from the device after communication is restored.
Bluetooth and Milesight ToolBox
VS321 is configured wirelessly via Bluetooth using the Milesight ToolBox app.
This makes it convenient to set device parameters even after it has been installed on the ceiling.
Approximately 11.3 years of operation in EU868 at SF7
VS321 is powered by four replaceable ER14505 Li-SOCl₂ batteries with a capacity of 2700 mAh.
Under Milesight test conditions, the EU868 version achieves approximately 11.3 years of operation at SF7 or approximately 7.5 years at SF10.
* Manufacturer test: 8 hours of operation per day, 5-minute detection and reporting interval, temperature 25°C. Laboratory results are indicative.
Temporary service power supply
The device has a USB-C port intended for temporary power during configuration or service work.
The manufacturer does not recommend powering VS321 via USB-C for extended periods, as this may cause the device to heat up and reduce detection accuracy.
PN: White or PN: Black
VS321 is available in two color variants: white and black.
The PN: White / Black designation specifies the enclosure color and does not change the sensor's functionality or technical parameters.
Compact enclosure for ceiling mounting
100 × 100 × 26 mm
The low-profile design allows the device to be discreetly integrated into the ceiling.
145 g
Its low weight facilitates installation using either screws or adhesive mounting.
White / Black
Two color versions allow the sensor to be matched to the interior design.
Key VS321-868M parameters
* Accuracy depends on the detection area, installation conditions and environment. ** At 15°C and an installation height of 3 m. *** Laboratory test: 8 h of operation per day, 5 min detection and reporting interval, temperature 25°C.
VS321 in a Smart Building system
Information about the number of people, workstation occupancy and environmental conditions can be automatically transmitted to a central platform.
AI occupancy sensor (white / black)
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Gross price $270.60incl. %s VATNet price $220.00without 23% VAT
