Bluetooth transmitter/receiver (Woolton L25)

This is my husbands who no longer needs it but he assures me it still works.
To be honest I have no idea what it is or what its for so the following information is from the Internet using the photo of the box.

'This is a 2-in-1 Bluetooth transmitter and receiver adapter, model number SK-BTI-018. It allows you to wirelessly stream audio from devices that don't have Bluetooth, such as a TV, to Bluetooth headphones or speakers (transmitter mode), or to stream audio from your phone to a wired speaker or other sound system (receiver mode).

Function: It has a 2-in-1 function that can either transmit or receive audio signals.

Connectivity: It connects to audio devices using a 3.5mm AUX jack.

Power: It is rechargeable and can provide up to 8 hours of battery life.

Compatibility: It is compatible with TVs, car stereos, PCs, headphones, and other stereo systems.'

Hope that makes it all clear, you live and learn everyday!!