?Features:
Equalizer and Tuner， two in one.
Power， volume and tone control knobs.
With pickup and  installation accessories， easy for use.
Flip-open battery pack on the surface.
Powered by 9v battery (not included).
Fit for folk， classical ，acoustic guitar etc.

Specifications:
Mode: JE-53
Input Resistor: 10M ┯
A4 frequency: 440Hz
Turning range: 0A-8C
Tolerance: +/-1 cent
Item size: Approx. 8.3 * 5.5 * 6.2cm / 3.3 * 2.2 * 2.5in
Item weight: 64g / 2.3oz  (without battery)
Package size: 10.6 * 7.0 * 7.0cm / 4.2 * 2.8 * 2.8in
Package weight: 94g / 3.3oz

Package List:
1 * Equalizer
1 * Pickup
1 * Installation Set