Video by KNA Pickups via YouTube
Source
KNA presents surface-mount pickup for string and percussion acoustic instruments. The UP-2 is light, small, portable and versatile piezo pickup solution that features easy Installation with zero modifications. It has beautiful wooden casing and can be sticked to the surface of any acoustic instrument. The upgraded design allows for convenient volume control afjustments. KNA UP-2 can be found at an affordable price.
https://bit.ly/KNA-UP-2
Petar Yordanov also known as Buny is a percussionist at the Bulgarian Ethnobass band – Oratnitza.
https://www.facebook.com/zaekbaek.zaekbaeklosh