From aliexpress

This is a cool light bar that reacts to music and sound unfortunately it does not have a battery inside in this version

You can see the USB support as well as the unoff button the music button and the mode button of the RGB music sound led bar
The LEDs of the RGB music sound led bar
The RGB music sound led bar PCB and its 3 other plastic companions
You can see there is a soldering point for a battery
RGB music sound led bar with an unmarked chip