PAM8403 XH-A153 2x5W Bluetooth Amplifier Module

PAM8403 XH-A153 is a product that allows you to make a wireless speaker thanks to Bluetooth and battery slot.

 

The battery slot on it is compatible with 18650 batteries. You can use a 18650 rechargeable Li-ion battery and charge it from the micro USB port on the product when it runs out. There are LEDs on the product that light up while charging and when the charge is full.