A:AnswerThey can be used for that purpose if you have a device to plug into or the tv itself if you have an extension cord. It will also work with the ROKU remote devise.
A:AnswerThe headphones is for her to hear and block out background noise. They don't have an attached microphone. You may need to add/buy a microphone, or at least check the settings on your computer to make sure she can be heard hope this helps.
A:AnswerThe length of cord from the base of earphones on my headset to my first extension is 48.5 inches. I did not buy an extension since I already had three which I had purchased some time ago at Best Buy. Total length of connection to my TV is 12.5 feet +/- 2 inches. Great earphones at a reasonable price.