What's in the box:

4-Band EQ Equalizer Piezo Pickup EQ-7545R Pre-Amp Acoustic Guitar Preamp Amplifier Tuner (Black)

Features:
4-band equalizer, push bass/middle/treble to adjust frequency.
Phrase and volume control.
LED for battery check, replace battery when Batt lights.
Powered by a 9V battery (not included).

Specifications:
Package size: 22 * 14 * 5.5cm / 8.7 * 5.5 * 2.2in
Package weight: 125g / 4.4oz

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