Classic 4 Acoustic Guitar Preamp
Bass,Mid,Treble,Brillance 4 Band EQ and Volume * Low battery indicator LED * Battery is not included· Internal size: 62mm x 43mm · External size: 79mm x 52mm Distance between 2 screws: 67mm x 42mm Famous brand and classic sound! This is the same unit which was used in Martin, Fender, Acoustic and other major brand guitars. it works great and sound wonderful..