QH-6B 12-Hole Magnetic Sound Hole Guitar Pickup Transducer Kit with Volume Controller Lapel Tie Clip Microphone Audio Cable for 38/39/40/41 Acoustic Guitar

12-hole magnetic transducer captures vibrations quickly and converts mechanical vibrations to an electrical signal.Easy to install, put the pickup into a sound hole and adjust the padded metal piece to fix it stably without a scratch and need of drilling h