People traffic counter VS351

infraredUSBwireless

Overview
The Milesight VS351 Mini AI Thermopile People Counter is a compact, energy-efficient sensor for bi-directional people counting. Combining a thermopile infrared array, radar-assisted wake-up (battery version) and AI filtering, the device provides anonymous, GDPR-friendly occupancy and flow data for wireless or wired deployments.

Key Features

• Bi-directional people counting with AI-based filtering to reduce errors from side-by-side and U-turn walkers
• Reliable accuracy up to 90% under recommended installation and environmental conditions
• Multi-sensor fusion: thermopile infrared array + radar (radar included in battery version) and integrated temperature sensor for optimized detection
• Ultra-low power consumption with configurable sleep/hibernate periods for battery operation
• Wireless connectivity via LoRaWAN® and Milesight D2D; Type-C wired option available for continuous power
• Local storage of up to 1,000 timestamped records with retransmission after reconnection to prevent data loss
• 100% anonymous detection; no personally identifiable information collected
• Snap-together installation system supporting ceiling and lintel mounting

Versions

• Battery Version: Wireless, radar-assisted wake-up + thermopile sensor, powered by replaceable batteries for off-grid deployments
• Type-C Version: Wired, powered via 5V/1A Type-C for continuous operation (thermopile-based)

Installation & Mounting

• Recommended installation height: 2.0 m to 3.0 m
• Example detection width: 3.6 m when installed at 3.0 m height
• Sensor adjustable angle: 0° to 90°
• Snap-together assembly; supports 1/4-inch screw hole for mounting bracket; ceiling and lintel mounting supported

Power & Operation

• Type-C version: powered by 5V/1A via Type-C port
• Battery version: 4 × 9000 mAh ER26500 Li‑SOCl2 replaceable batteries
• Battery life example: ~1.7 years (SF7, EU868 & US915) under test conditions; ~1.6 years (SF10) based on typical reporting intervals and usage
• Configurable sleep/hibernate periods to minimize power consumption during unoccupied times

Integration & Data Handling

• Protocols: LoRaWAN® (OTAA/ABP Class A) and Milesight D2D for direct device-to-device linkage
• Internal antenna
• Data features: local storage of historical records, retransmission after reconnection, downlink configuration and NFC mobile configuration

Privacy & Compliance

• Designed for anonymous thermal/radar detection; does not collect PII and is suitable for GDPR-compliant deployments
• Supports local device linkages (e.g., lighting control) via Milesight D2D without transmitting personal data

Accessories & Install Experience

• Snap-together bracket system for simplified installation and height adjustment
• Optional multifunctional mounting bracket available for lintel and ceiling mounting

Specifications

• Model: VS351
• Measurement: People counting (bi-directional)
• Technology: Thermopile infrared array + Radar (Radar available in Battery Version)
• Recommended installation height: 2.0 m ~ 3.0 m
• Detection width example: 3.6 m @ 3.0 m installation height
• Sensor adjustable angle: 0° ~ 90°
• Best operating temperature for counting accuracy: 15 °C ~ 30 °C
• Temperature sensor range: -30 °C ~ 70 °C; accuracy: ±2 °C
• Wireless protocols: LoRaWAN®, Milesight D2D
• Antenna: Internal
• Frequency bands: 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
• Local button: 1 × internal reset button
• Configuration: NFC via mobile app; downlink configuration supported
• Advanced features: Local data storage (1,000 entries), retransmission, Milesight D2D controller compatibility
• Power supply: Type-C 5V/1A; Battery version uses 4 × 9000 mAh ER26500 Li‑SOCl2 (replaceable)
• Battery life (example): ~1.7 years (SF7, EU868 & US915) based on 30-min interval, 25 °C, 1000 people/day
• Operating temperature (device): -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
• Material & color: PC (flame retardant), White
• Weight: Type-C Version ~72.3 g; Battery Version ~383 g
• Installation methods: Ceiling mounting, lintel mounting
• Regulatory approvals: CE, FCC