This is a pre-amp unit, perfect for mounting directly into the side of your standard acoustic guitar or cigar box guitar.
For standard acoustic guitars, this Curve pre-amp gives you an on-board equalizer and volume control and helps boost and clarify the signal before it goes to your amplifier. For cigar box guitars, using a FLAT pre-amp is guaranteed to make your CBG sound better, compared to wiring a piezo straight to a jack.
The rod-style piezo can be built to go under the saddle on standard guitars, and can be built into a bridge or placed directly under the bridge for optimal vibrational pickup on cigar box guitars.

Specifications:
Flange measurements: 4 1/16" L x 1 3/4" W
Fits a hole of size: 3 3/4" L x 1 9/16" W
Presence Control: ±12dB at 8KHz
Bass Control: ±12dB at 600Hz
Middle Control: ±12dB at 600Hz
Treble Control: ±12dB at 2.2KHz
Input Impedance: 10MΩ
Frequency Response: 20Hz - 20KHz
Power: 9V alkaline battery (not included)
Pickup dimensions: 4 x 1.9 x 2.4inches

Package List:
1 * 4 Band EQ Equalizer
1 * End Pin Jack
4 * Mounting Screws
1 * Screw Cap