Features:

Phase control button 
Build-in tuner 
Low profile control knobs 
Low battery indicator(powered by 9V battery) 
With volume control and Bass/Mid/Treble control 
Pre-wire pickup for solder-free, plug and play installation 
Small footpint for easy access to controls 
Combined Battery box with preamp 

Specifications:

Material: electronics + plastic housing
Colour: Black
Single Product size: 5.5CM*4.5CM*8CM
Weight: 184g
Quantity: two pieces
SKU: GE0908-031

Packages: 

The one set including:
2 x Onboard Preamp Pickup Tuner
2 x End Pink Jack
8 x Mounting Screws
4 x Mounting Brackets
1 x User Manual