Your instrument is not listed?
The AirCapt air microphone is generally used in addition to a contact microphone. It is a very small microphone designed to be placed closer to the sound source for more gain, less feedback and ambient sounds. Particularly suited to acoustic stages, it faithfully and very naturally reproduces the sound of your instrument with precision, dynamics and allows comfortable levels on stage without microphone stand. It is usually placed outside, at the edge of the soundhole, treble side, or sometimes it have good results inside.
The contact microphone is typically used as a base system for many instrument, you can easily use it in an amp, apply effects and make clean loops…. The X-Jack model is the most sold because it is removable, but also for its two separate outputs Jack and XLR usable simultaneously. It therefore does not require intervention on the instrument while being able to remain permanently installed. The contact microphone is placed inside or outside depending of the instrument.
The X48C, removable, simple, XLR output, work with phantom power.
N°3 : The inside J48C is also very appreciated. Installed version, it has a volume knob and 9v battery option to work with an unbalanced jack.