Characteristics: No need to cut additional holes in the guitar, just attach the transducer to the sound hole Dual transducer, delivers amazing sound effects. GGP-01 is a piezoelectric transducer with two microphones. It provides a mellow, soft sound that's perfect for an acoustic guitar or enhances tapping by giving it depth. The transducer can pick up a much wider range of frequencies, perfectly enhancing the sound. Built-in EQ function allows you to adapt to different guitars and give the most optimal effect Possibility to change the phase of the transducer Minimal noise thanks to good shielding and anti-interference filter Made of premium materials. All connectors have a thick gold coating, and electronic components of the best brands are used to ensure stable operation. The mounting clamp guarantees a strong connection and is designed not to damage the surface of the guitar Low power consumption, long battery life - it can run for 40 hours without interruption The brown metal casing with a wood texture gives a classic and elegant look The transducer is designed for classical and acoustic guitars with a size of 36-42 inches Equipment: Cable with Jack input, Piezoelectric transducer, cable holder, user manual, 4 CR2032 batteries