This is a Zhichuang Y7 Sound Bar, also sold as the Bakeey Y7, and about five years old. It is not designed as a TV sound bar.

It has:
Dual channels with bass diaphragm
Rechargeable lithium battery
3.5mm socket
Slot for a micro-card.
A remote control.

I was able to Bluetooth pair with an older smart phone but have not been able to do this with a more recent phone.

So unless you know how to overcome the pairing issue, the only way to connect will be via a cable with a 3.5mm jack, which I am not providing.

Or possibly via the USB charging cable that I am providing.

I assume, you could play mp3 recordings without connecting by inserting a micro-card. I have never tried this.

The bar is 43 cm long.

Please note I won't be able to respond till Monday evening.

Battery Powered Sound Bar (Glyne Gap TN40)