Milesight VS321 AI Workplace Occupancy Sensor
Authorised Milesight UK Distributor£124.20 ex VAT (£149.04 inc. VAT)
Up to 95% occupancy accuracy via PIR + RGB camera with embedded AI
VS321 is a battery-powered LoRaWAN AI occupancy sensor for ceiling mounting at 2.4 m to 4 m, with an effective detection range of 6.0 m × 11.0 m at 4 m (optimal 4.6 m × 8.7 m) and detection accuracy up to 95%. It switches between people counting and desk occupancy modes and adds temperature, humidity and light sensing. No images are collected.
Installation height / effective detection range2.4 m ~ 4 m; 6.0 m × 11.0 m effective range at 4 m
Not sure this is the right model?
In stock · typically dispatched within 14 working days from the UK
● Quotes answered within one working day · UK support
Delivery & assurance
- Ships from the UK
- £14.25 flat UK delivery
- Secure checkout — card, Klarna, invoice
- Manufacturer's warranty
Questions about this product? Call our UK team: 023 9223 3611
Description
The VS321 is a Milesight ai workplace occupancy sensor — up to 95% occupancy accuracy via PIR + RGB camera with embedded AI.
Key features
- Up to 95% occupancy accuracy via PIR + RGB camera with embedded AI
- 100% anonymous, GDPR-compliant detection (no identifying images stored)
- FOV 129 x 93 degrees; PIR radius ~4 m at 3 m mount height
- Connectivity: LoRaWAN plus Milesight D2D gateway-free control
- Power: 4x ER14505 batteries, 10+ years life; built-in temp/humidity/light sensors
Supplied by Indiott, the UK industrial IoT specialists, with engineer-led support. Request a quote for pricing, stock and lead times.
Additional information
| Weight | 0.145 kg |
|---|
VS321-868M specifications
| Measurement | People counting & occupancy detection |
|---|---|
| Detection accuracy | Up to 95% (tested within optimal detection range) |
| Field of view | 129° horizontal, 93° vertical |
| Installation height | 2.4 m ~ 4 m |
| Required illumination | 50 Lux |
| PIR measuring angle | 115° |
| PIR detection area | Radius 4 m (15°C, 3 m installation height) |
| Temperature range / accuracy | -40°C ~ 125°C, ±1°C, resolution 0.1°C |
| Humidity range / accuracy | 0 ~ 100 %RH, ±2.5 %RH, resolution 0.5 %RH |
| Light sensor | Photodiode, Bright/Dim status |
| Protocol | LoRaWAN®, Milesight D2D |
| Frequency | CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4 |
| Tx power | 16 dBm (868 MHz) |
| Sensitivity | -137 dBm @300bps |
| Work mode | OTAA/ABP Class A |
| Configuration | Bluetooth |
| Advanced features | D2D controller, data storage (2045 entries), data retransmission, data retrievability, threshold alarm, hibernate mode |
| Power supply | 4 × 2700 mAh ER14505 Li-SOCl2 replaceable batteries |
| Battery life | Around 11.3 years (SF7, EU868); around 7.5 years (SF10, EU868 & US915) — 8 h/day, 5-min interval, 25°C |
| Operating temperature | 0°C ~ +30°C |
| Ingress protection | IP30 |
| Dimensions | 100 × 100 × 26 mm (3.94 × 3.94 × 1.02 in) |
| Weight | 145 g (batteries excluded) |
| Installation | Ceiling mounting (screws or adhesive backed fixed) |
| Approvals | CE, FCC; RoHS (planned) |
Specifications taken from the manufacturer datasheet.
Which version do I need?
The frequency plan is fixed per part number. The -868M suffix is the EU868 band version, which is the one a UK buyer needs; quoted battery life at SF7 EU868 is around 11.3 years. Housing is white or black (optional).
Typical applications for the VS321-868M
- Meeting room occupancy detection
- Open-plan office desk occupancy
- Campus and workplace space utilisation
- People counting in small rooms
- Lighting and HVAC control triggered by occupancy via D2D
- Ambient temperature, humidity and light monitoring
Buying guides for this product
Frequency band
Supplied on EU868, the LoRaWAN band used in the UK and across Europe. That is the default and you do not need to ask for it — the -868M in the part number is the EU868 build.
The same VS321-868M unit also covers IN865 and RU864. Those bands share the 863–870 MHz radio with EU868, so one device can be set to any of them in its own configuration — no different part number needed.
CN470, US915, AU915, KR920 and AS923 are a different radio and therefore a different build. Milesight makes them and we can order them: tell us where the devices are being deployed and we will confirm the part number, price and lead time.
Not sure which band applies where? The Things Network publishes the LoRaWAN frequency plan for every country.
Complete the stack
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VS321-868M — frequently asked questions
How high can VS321 be mounted, and what does it cover?
2.4 m to 4 m. At 2.4 m the effective range is 2.6 m × 5.0 m (optimal 1.4 m × 3.0 m); at 4 m it is 6.0 m × 11.0 m (optimal 4.6 m × 8.7 m). Milesight recommends >2.4 m for sedentary objects and >3 m for standing objects.
How long do the batteries last and can they be replaced?
It uses 4 × 2700 mAh ER14505 Li-SOCl2 replaceable batteries. Around 11.3 years at SF7 EU868 or around 7.5 years at SF10, tested at 8 hours per day, 5-minute detection and report interval, 25°C, under laboratory conditions.
Does it need room lighting to work?
Yes — required illumination is 50 Lux. It also carries a PIR sensor (115° measuring angle, 4 m radius at 3 m height) that triggers detection, and a photodiode light sensor reporting Bright/Dim.
Is it privacy safe for meeting rooms?
The datasheet states it is fully GDPR-compliant with no image collection.
What is the operating temperature range?
0°C to +30°C with 0-95% non-condensing humidity and IP30 protection — an indoor, conditioned-space device.
Does it require a gateway?
It is fully compatible with standard LoRaWAN gateways and network servers. It also acts as a Milesight D2D controller for direct device-to-device control without gateway dependency.
How much does the Milesight VS321 AI Workplace Occupancy Sensor cost in the UK?
The Milesight VS321 AI Workplace Occupancy Sensor is £124.20 ex VAT from Indiott, a UK distributor. The price is published rather than quote-only, and we invoice with VAT (PSI Technologies Ltd, VAT GB 730 2340 83). UK delivery is a flat £14.25 per order ex VAT, whatever the weight.
What is the lead time and delivery cost for the Milesight VS321 AI Workplace Occupancy Sensor?
The Milesight VS321 AI Workplace Occupancy Sensor is in stock and typically dispatched within 14 working days from the UK. UK delivery is a flat £14.25 per order ex VAT, whatever the weight or how many items you order. We ship to GB and the EU and provide a VAT invoice with every order.
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