Bluetooth speakers can be connected to Prota from the Settings app.
Go to the Settings and open the Network settings tab. Choose the Bluetooth menu and tap on the Bluetooth device you want to connect.
Sometimes, your bluetooth speaker might not appear on the list. Your Prota will scan for bluetooth devices every 10 seconds. When you have this problem with your Prota, please wait a few minutes until devices are shown. If the devices still don't appear, reboot your Prota.