The Neo-Buster from Fishman combines their popular Neo-D Single Coil pickup with a feedback-fighting soundhole cover to give you great sounding acoustic tone, even in your loudest performances.This single coil magnetic soundhole pickup shares the same neodymium magnet structure as the award winning Rare Earth pickup for exceptional string balance and sparkling acoustic clarity. It"s low-profile, high-impedance design needs no battery.When you need to play in high-volume situations, the integrated sound-hole reduces the build-up of energy inside the soundhole that often leads to uncontrollable howling. Made of a flexible elastomer, it requires no tools for installation and will not react with most finishes.