Andoer Handcraft Rose Wooden Magnetic Soundhole Pickup Humbucking Amplifier Transducer Adjustable Tone Volume 6.3mm Jack with Microphone for 39"/40"/41"/42" Acoustic Guitar Manual pick-up is made of rose wooden, soundhole pickup for acoustic guitar. Magnetic transducer captures vibrations quickly. 6.3mm female converter converts mechanical vibrations to an electrical signal. With the effect of active pickup changing to passive pickup. Also can produce the effect of playing board beat.