Our products do not need Bluetooth but they need WIFI (or 3G/4G/5G).
The clip-on transmits data over a LoRa network to a gateway that transmits the data to the cloud. Then it returns over the LAN (desktop) or local WiFi (or 3G/4G/5G) to the cell phones of the nurses.
With 1 gateway you can cover a big area (rooms, central rooms, even part of the garden). How far it reaches depends on the construction of the walls. In open terrain, the signal reaches further than a kilometer.