Barcus Berry BREEZEII Acoustic Guitar Preamplifier System 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. After 2 minutes an Auto-Off feature turns off the tuner to conserve battery power. Tuner can also be manually disabled by pressing and holding the tuner button until flashing LEDs are extinguished.