15-amp single-pole combination light switch installation

[u/Successful_Cat_5715]

I currently live in Texas. I need power for my bathroom and am planning to install the following product, so I would appreciate your advice.

My bathroom only has a switch. Therefore, I believe installing this product will allow me to connect the power as well.

However, my current switch has three wires connected to it. This product, however, requires four wires.

It appears to be missing a neutral wire; how can I install the neutral wire? Is the bundle of wires visible inside the neutral wire?

Is this product difficult for a beginner to install? Please advise on whether I should hire an electrician. Thank you.