Garrett Metal Detectors Metal Detector GTI 1500 - Manual (Page 59)

HEADPHONE JACK
The headphone jack is located at the rear
of the battery pack under the armrest.
Headphones are a valuable accessory
for any metal detector to mask interfer-
ence from outside noise. Headphones are
particularly essential when hunting where
noise (running water, people, surf, traffic,
etc.) is excessive. Use of headphones will
also extend battery life.
Graphic Target Imaging 1500 - 59