A:Answer Steelerfaninkc,
Although I have not tried this yet in a guitar amp, I assume it would as long as it is a 3.5 mm AUX OUT jack. Interesting application though...didn't think of that. I will say that the store clerk that helped me choose this at BBuy did warn me that there can be a slight delay from a video sound output like a TV / DVD-Bluray player to your bluetooth headset where the video characters' mouth is slightly ahead of the words. I did experience that a couple times on different devices but didn't bother me too much...however, in your "audio only" application it wouldn't apply. Some of this issue may depend upon the type of audio output device one plugs it into or distance away from transmitter that you happen to be at on bluetooth But definitely was advice that I appreciated knowing ahead of time...but for the $30 or so cost, I didn't expect it to be a high-tech experience.
I use a Bose QuietComfort 35 bluetooth headset for your info. Battery charge on unit might last a few hours of video per my experience...not sure the "10 hours" on the back of box packaging is factual. They recommend charging for at least 3 full hours before using...mine took only an hour or so until the "red charge light" went off so maybe it needed more.
Packaging support call in number is 1-866-580-1978 (Irvine, CA) or email: support@aluratek.com if you have any further technical questions.
Hope this helped.