Check the listing for details. Onboard Preamps Isys+ EQ PICKUP for Acustic Guitar. Color: Black, Condition: New. Listed at 14.99 USD. Isys Onboard Preamp Systems are dedicated to providing maximum value in a small footprint. Available in three models, these preamp systems feature Volume, Tone shaping, and Phase controls; a pre-wired Sonicore pickup and low profile control knobs. Also included are a low battery indicator and a separate battery box. Isys+ Features Small footprint fits many guitars. Volume control. EQ tone shaping control. Phase switch. Low battery indicator. Pre-wired Sonicore pickup for easy solder-free installation. Low profile control knobs. Onboard easy to read 7-segment LED tuner. Bass and Treble controls for enhanced tone shaping. Package Include: 1 Set of ISYS+ EQ Isys Onboard Preamp Systems are dedicated to providing maximum value in a small footprint. Available in three models, these preamp systems feature Volume, Tone shaping, and Phase controls; a pre-wired Sonicore pickup and low profile control knobs. Also included are a low battery indicator and a separate battery box. Isys+ Features Small footprint fits many guitars. Volume control. EQ tone shaping control. Phase switch. Low battery indicator. Pre-wired Sonicore pickup for easy solder-free installation. Low profile control knobs. Onboard easy to read 7-segment LED tuner. Bass and Treble controls for enhanced tone shaping. Package Include: 1 Set of ISYS+ EQ