Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Types of Technology/Devices, working range and use cases.
| Technology/Device | Detection Range | Use Cases |
|---|---|---|
| Infrared | up to 10 m (30 ft) | Doors, elevators, lavatories, health |
| NFC | 10 cm | Payments |
| Personal Device | Depends on Wifi Range | Public Screens, smart homes |
| Leapmotion | 25–600 mm (1 inch–2 ft) | Education, Health |
| Microsoft Kinect | 1.2–3.5 m (3.9–11.5 ft) | Education, Health |
| QR Code | Depends on size of QR code | Kiosks, Payments, Screen takeover |
