Descrição
The Milesight VS121 is an AI workplace occupancy sensor for offices, meeting rooms, open-plan floors, libraries and retail zones. Mounted on the ceiling, it counts how many people are in up to 16 areas and how many cross a line, so you can plan desks, rooms and cleaning on real use. Detection is anonymous on the device. Choose LoRaWAN for wireless installation or PoE for wired networks.
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Key features
- AI occupancy detection: Milesight states up to 95% recognition rate (line-crossing, within the recommended detection range).
- Very wide view: 190° × 112° field of view; Milesight states up to 127.84 m² coverage from one sensor.
- Region and line counting: up to 16 regions with dwell time, bi-directional line crossing with U-turn filtering, people-flow analysis.
- Privacy tools: up to 8 privacy masks (normal or blur), scheduled detection.
- Two connection types: LoRaWAN Class C (Type-C powered) or PoE with MQTT(S), HTTP(S) API and BACnet/IP.
- Alerts: overcrowding alarm and data retransmission after network outages.
Which VS121 do I need?
About the SKUs: SKUs starting with NF are Vemco's codes for Milesight VS-series sensors delivered with Vemco firmware. NF121 is the Milesight VS121 (LoRaWAN) and NF121-P the VS121-P (PoE). "-High" marks the high ceiling mount version; the colour suffix is Vemco's.
| Shop SKU | Milesight model | Connectivity | Frequency plans / regions |
|---|---|---|---|
| NF121-White, NF121-Black | VS121, standard 2.3–4 m | LoRaWAN Class C, USB Type-C 5 V power | 868M band: EU868 (Europe, Middle East, Africa), IN865 (India), RU864 (Russia); or 915M band: US915 (North America), AU915 (Australia, Latin America), KR920 (Korea), AS923 (Asia-Pacific). Tell us your region when ordering. CN470 on request. |
| NF121-P-White, NF121-P-Black | VS121-P, standard 2.3–4 m | Ethernet, IEEE 802.3af PoE or 5 V DC | No radio, works worldwide. |
| NF121-White-High, NF121-Black-High, NF121-P-White-High, NF121-P-Black-High | VS121 high ceiling mount, 5–7 m | LoRaWAN or PoE | As above. Milesight's current datasheet lists only the 2.3–4 m version, so ask us to confirm availability before ordering. |
Coverage by mounting height
Detection range per sensor (standard version), from the Milesight VS121 datasheet. Milesight recommends more than 2.5 m for seated people (region counting) and about 3 m for standing people (line crossing).
| Mounting height | Detection range |
|---|---|
| 2.3 m (7.5 ft) | 7.4 × 2.8 m |
| 2.5 m (8.2 ft) | 9.6 × 3.6 m |
| 3.0 m (9.8 ft) | 12.3 × 5.0 m |
| 3.5 m (11.5 ft) | 18.6 × 7.6 m |
| 4.0 m (13.1 ft) | 19.3 × 8.3 m |
Technical specifications
| Technology | AI image analysis on the device, anonymous detection |
| Field of view | 190° H × 112° V |
| Mounting height | 2.3–4 m, ceiling mount (standard version) |
| LoRaWAN version (VS121) | Class C, OTAA/ABP; CN470, IN865, RU864, EU868, US915, AU915, KR920, AS923; Milesight D2D; Type-C 5 V / 3 A, 9.4 W |
| PoE version (VS121-P) | 1 × RJ45 10/100 Mbps, IEEE 802.3af PoE (8.2 W) or 5 V DC; 1 × DI, 1 × DO |
| Protocols (PoE) | MQTT(S), HTTP(S) API, BACnet/IP, RTSP, NTP, SSH |
| Wi-Fi | 2.4 GHz, for configuration only (LoRaWAN version) |
| Environment | Indoor, IP30; −20 to +60 °C; 0–95% RH non-condensing |
| Dimensions and weight | LoRaWAN 85 × 85 × 20 mm, 130 g; PoE 85 × 85 × 30 mm, 178.6 g |
| Housing and colour | PC and cast aluminium; LoRaWAN white or black, PoE white (Milesight datasheet) |
| Certifications | CE, FCC, RoHS (LoRaWAN version also SRRC) |
Source: Milesight VS121 / VS121-P datasheet and the Milesight VS121 product page (PDF, no sign-up).
Sensor and software: what you get
On the sensor: people counts per region and line, dwell time, privacy masks and data push. In software: room and floor utilisation, trends and reports. Vemco delivers the VS121 with Vemco firmware, ready for VemSpace workplace analytics and VemCount zone counting, with a 60-day free trial (see software plans). The hardware price does not include a software licence.
Installation and accessories
Mount the sensor centrally on the ceiling of the room or zone at 2.3–4 m. The LoRaWAN version needs a USB Type-C 5 V power supply and a gateway such as the UG65 (indoor) or UG67 (outdoor) on the same frequency plan. The PoE version runs on any IEEE 802.3af switch. For desk-level occupancy add the VS341 desk sensor; for air quality in the same rooms see the AM307.
Frequently asked questions
How accurate is the Milesight VS121?
Milesight states up to 95% recognition rate, tested for line-crossing detection within the recommended detection range.
How large an area does one VS121 cover?
At 3 m mounting height about 12.3 × 5.0 m; at 3.5 m about 18.6 × 7.6 m. Milesight states up to 127.84 m².
Is the VS121 battery powered?
No. The LoRaWAN version is powered by USB Type-C (5 V), the PoE version by IEEE 802.3af PoE or 5 V DC.
Does the VS121 support BACnet?
Yes, the PoE version (VS121-P) supports BACnet/IP as well as MQTT(S) and HTTP(S).
Which LoRaWAN frequency do I need?
868M for Europe, the Middle East, Africa, India and Russia; 915M for the Americas, Australia, Korea and most of Asia-Pacific.