Barcus Berry Acoustic Guitar Preamplifier System's professional quality and features for the most accurate production of your guitar's natural sound. On board tuner is present for convenient tuning no matter where you are. The Breeze II system features a three band EQ and an on board digital tuner. Simplified and reliable sound control. Specs are volume, 3-band EQ, strap button 1/4-Inch output jack, piezo under-saddle pickup. Tuner ON mutes the preamp output while tuning.