Empress Effects Buffer+ - Manual (Page 5)

Controls at a Glance
power: 9V DC negative
tip 2.1mm jack. 42mA or greater.
guitar in: plug your guitar in here.
The high impedance input will not
load down your guitars pickups
and will result in the full range of
your tone to pass through.
amp out: This buffered output can
drive a long cable run without
signal loss.