This tiny microphone pointed out by the white tooth pick transmits the acoustic sound from inside the ukulele and adds an interesting and impressive sound to your amplified music. It is all quite amazing. You can even talk into the sound hole and hear yourself on your amplifier.
This is the MiSi Trio Air ukulele and guitar pickup. It picks up sound also from the under saddle piezo. Each sound source is controlled by its individual volume wheel. Works like a charm.