The Z-Pro Buffer is an impedance adapter/"buffer" designed for professional use.
If you have a lot of true bypass unbuffered effects pedals - or a long cable run back to the amp (over 4 metres) - then your sound can be compromised. The Z-PRO Buffer, connected between instrument and amplifier or effects chain , retains the clarity and high end definition of your sound thanks to its perfect impedance matching.
The Z-PRO Buffer requires very little space (38 X 92 mm) on the board and is always on.
For more details see the manufacturers website here