Replace a vendor hub
Some Bluetooth devices come with a vendor hub that connects them to an app. If Home Assistant has a Bluetooth integration for the device, Connect AUX-2 can take the hub's place when it's in range. For example, the SwitchBot Bluetooth (opens in a new tab) integration doesn't need a SwitchBot Hub.
Cover more rooms
You can run several Bluetooth proxies, including Connect AUX-2, to extend coverage across rooms and floors. Place them far enough apart to avoid interference. See Bluetooth (opens in a new tab) in the Home Assistant documentation.
Bluetooth audio
Connect AUX-2 doesn't support Bluetooth audio. It can't play audio to Bluetooth speakers or headphones, or receive audio from a phone over Bluetooth. For details, see Using Connect AUX-2 as a Bluetooth proxy (opens in a new tab).