I bought an used resonator guitar from eBay, and I found out it has some kind of pickup.
A pickup is a nice-to-have feature, no must-feature.
I have not seen a pickup like this before. It has no battery. After I connected it with my amplifier, no sound came out of it. I think this is just logical, since a pickup usually requires a battery.
So my question is, what is this and how can I use a pickup like this? Or maybe it is just a fake, to sell it better?
Note that there is a white strap under that black thing, so it is meant to be removeable.