I previously connected a device to the DM-40D-BT speakers via Bluetooth, but now I can't connect it again. How do I reconnect?

Follow the steps below:
1. Turn on the Bluetooth function on the Bluetooth device.
2. Follow the instructions for the Bluetooth device to make it 'forget' the speakers, then pair them again.

*You may need to refer to the instruction manual of the Bluetooth device.