| MDPI | Multidisciplinary Digital Publishing Institute |
| BLE | Bluetooth Low Energy |
| RSSI | Received Signal Strength Indicator |
| RF | Radio Frequency |
| US | Ultrasonic |
| CPU | Central Process Unit |
| HVAC | Heating, Ventilating and Air Conditioning |
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.