Speaker Amplifer Kit. This kit contains PAM8403 Amplifier Board, Bluetooth Module, 4056 Battery Charging Module. You just need 2 Speaker and 1 18650 lithum ion battery to power. That's all, you circuit is complete and you have a new speaker. PAM8403 support dual speaker up to 5 watts each.  you can use 2 pcs battery also to incease th back up time. Connection should be in Parallel of two battery. For you better understanding we have added the circuit diagram too.