Yes, WiiM Pro can serve as the Bluetooth receiver and transmitter. If you have multiple WiiM Pros or Minis, you can simultaneously play your Bluetooth audio to a group of devices.
Note:
However, it doesn't support multiple connections of Bluetooth devices. When one device is connected, you can put the WiiM Mini into pairing mode and start to pair with it. It'll forget your previous connected device.
Please refer to the following link for a step-by-step guide on Bluetooth pairing: [How to send the output of WiiM device wirelessly to another BT devices such as speaker or headphone]. This link will provide you with detailed instructions and tips to ensure a successful pairing experience.