My husbands mouse battery is empty, it says to connect with USB

Nice to meet you, *****!

A USB port is a standard cable connection interface for personal computers and consumer electronics devices.
It should be installed on your computer by default.
What is the model of your computer?

I can show you how to do it, *****
But I need to know your mouse and computer model first.

I understand that, *****
Do you know the model of your mouse?

And the brand?

Ok
Does your mouse have a cable linked to it?

Ok, do you have a standard apple lighting cable near you?
For example, the one you're using to charge your iPhone or iPad?

Great
Flip over your mouse.

Do you see the cable port at the bottom of your mouse, like in this picture?

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Ok
Plug the end of the back in to this port

Like you do when you're charging the iPhone

Great
The other end of the cable
You can plug into one of your computer's USB ports
Just take off the adapter (the part on the end of the cable that you use to connect it to the wall outlet)
And go to your computer
What is the model of your computer, by the way?

Ok, please tell me what is the model of your computer, *****

Ok, then you can charge your mouse as you're charging your iPhone or another device
Connect it to the wall outlet with the adapter

That's ok, *****
You can charge your mouse as you charge your iPhone

No need to connect it specifically to your computer.

Is it charging, *****?

About 2 hours, *****
When your mouse is connected for charging there is a small green light near the usb connection.

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I’m glad I was able to get that sorted out for you. Is there anything else I can assist you with today?