A Piezo Buffer is an impedance converter that allows you to match the high input impedance of piezoelectric transducers to the input of an amplifier or guitar effects pedal. 
The voltage gain of a piezo buffer is "1," meaning the input and output audio signals will have exactly the same amplitude. This makes the buffer highly transparent.

Features:

 > Preamp is analog design,

 > Low noise,

 > Handmade, high quality, each preamp tested,

 > Power: 9V battery (the battery is not included),

 > Low current consumption,

 > High input impedance,

 > Input: 2.5mm jack connector,

 > Small size: 31 x 26 x 10mm,

 > Easy instalation on guitar,

 > Included: manual (pdf), battery connector, connection wires,

 > Ability to work with other instruments than guitars.

PRICE: 35 EUR