Milesight VS351 Thermopile People Counter
Authorised Milesight UK DistributorPrice range: £118.21 through £148.14 ex VAT (£141.85 – £177.77 inc. VAT)
VS351 is a LoRaWAN people counter that uses thermopile sensing, with radar on the battery version, to count entries and exits bi-directionally at an indoor doorway. The decisive spec is coverage: it mounts 2 m to 3 m high and covers 3.6 m of detection width at 3 m. It captures no images, so counting stays anonymous, and quotes 80-90% accuracy.
Detection width at installation height3.6 m at 3 m installation height (installation height range 2 m ~ 3 m)
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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
VS351 is a compact AI thermopile people counter designed for indoor entrance and exit applications. It offers high accuracy in bi-directional people counting, enabling effective analysis of foot traffic and efficient space management.
Combined with a radar sensor for
presence detection, it intelligently schedules the activation time of the thermopile to optimize power consumption. As a Milesight D2D controller, the VS351 seamlessly communicates with other Milesight D2D devices, establishing more possible connections and paving the way for smoother operations.
With easy configuration and wireless detection, the VS351 facilitates simple deployment and connectivity. Compliant with the Milesight LoRaWAN® gateway and Milesight IoT Cloud solution, users can know the number of people in any indoor space and trigger other sensors or appliances easily via a webpage or mobile App remotely.
Additional information
| Weight | 0.145 kg |
|---|
VS351-868M specifications
| Counting technology | Radar (battery version only) & thermopile |
|---|---|
| Counting accuracy | 80% - 90% for bi-directional people counting (tested at 2.7 m installation height, 1.7 m average target height, 25°C) |
| Installation height | 2 m ~ 3 m |
| Detection width | 3.6 m @ 3 m installation height (2.0 m height: 1.6 m; 2.4 m: 2.57 m; 2.8 m: 3.2 m) |
| Sensor adjustable angle | 0° ~ 90° |
| Best operating temperature | 15 °C ~ 30 °C |
| Temperature range | -30°C ~ 70°C |
| Temperature accuracy | ± 2°C |
| Privacy | 100% anonymity and GDPR-compliant, no image capturing |
| 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)/19 dBm (470 MHz)/22 dBm (915 MHz) |
| Sensitivity | -137 dBm |
| Mode | OTAA/ABP Class A |
| Advanced features | Data storage (1,000 entries), data retransmission, data retrievability, Milesight D2D controller |
| Configuration | NFC via mobile app, downlink |
| Power supply | 5V/1A by Type-C port (both versions); 4 × 9000 mAh ER26500 Li-SOCl2 replaceable batteries (battery version only) |
| Battery life | Around 1.7 years (SF7, EU868 & US915); around 1.6 years (SF10, EU868 & US915) at 30-min interval, 25°C, 1000 people per day |
| Operating temperature | -20°C ~ 60°C |
| Relative humidity | 0% ~ 95% (non-condensing) |
| Ingress protection | IP30 |
| Dimensions | Type-C version: 70 × 68 × 32 mm; battery version: 188 × 68 × 32 mm |
| Weight | Type-C version: 72.3 g; battery version: 383 g |
| Material & colour | PC (flame retardant), white |
| Installation | Ceiling mounting, lintel mounting |
| Approvals | CE, FCC |
Specifications taken from the manufacturer datasheet.
Which version do I need?
-868M is the EU868 band for UK use. The datasheet also documents two hardware versions: a Type-C version powered from 5V/1A over USB-C (70 × 68 × 32 mm, 72.3 g), and a battery version with four 9000 mAh ER26500 cells that also carries the radar sensor (188 × 68 × 32 mm, 383 g). Radar-assisted presence detection is on the battery version only.
Typical applications for the VS351-868M
- Meeting room occupancy counting
- Office building foot traffic analysis
- Bi-directional entrance and exit people counting
- Space utilisation and management
- Triggering lighting or HVAC by occupancy via Milesight D2D
- Anonymous footfall reporting where cameras are unacceptable
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 VS351-868M 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.
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VS351-868M — frequently asked questions
How wide an entrance can it cover?
Detection width scales with mounting height: 1.6 m at 2.0 m, 2.0 m at 2.2 m, 2.57 m at 2.4 m, 2.9 m at 2.6 m, 3.2 m at 2.8 m and 3.6 m at 3.0 m. The permitted installation height range is 2 m to 3 m.
How accurate is the counting?
The datasheet quotes 80% to 90% detection accuracy for bi-directional people counting, tested at a 2.7 m installation height with an average target height of 1.7 m at 25°C. Best operating temperature is 15°C to 30°C.
Does it record video or images?
No. It uses thermopile sensing with no image capturing, which the datasheet describes as 100% anonymity and GDPR-compliant.
What is the battery life on the battery version?
Around 1.7 years at SF7 and around 1.6 years at SF10 on EU868, using four 9000 mAh ER26500 Li-SOCl2 replaceable batteries, tested at a 30-minute interval, 25°C and 1000 people per day.
Can it be used outdoors?
No. It is rated IP30 and designed for indoor entrance and exit applications, with an operating range of -20°C to 60°C and 0-95% relative humidity, non-condensing. It mounts on a ceiling or lintel.
How much does the Milesight VS351 Thermopile People Counter cost in the UK?
The Milesight VS351 Thermopile People Counter starts at £118.21 ex VAT from Indiott, with the exact figure depending on the variant you choose. Indiott is a UK distributor and invoices 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 VS351 Thermopile People Counter?
The Milesight VS351 Thermopile People Counter 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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