Andoer Acoustic Guitar Transducer Pre-Wired Amplifier Piezo Jack Pickup Accessory This transducer pickup which has been specially designed for acoustic instruments, is a very little device lets you turn your acoustic into an electro-acoustic, giving your instrument a new lease of life for amplification purposes. Fit for almost string music instruments such as guitar ,violin ,mandolin ,banjor etc. Remove the plastic film from the back of the transducer to expose the adhesive. Place the transducer through the sound hole to the lower part of the front body where the guitar produces the best tonal response. Be sure to remove any dust before placing pickup will reproduce a full, natural, transparent tone. Pickup senses the microvibrations of a soundboard. Easy to install, convenient to use.