Garrett Metal Detectors Sea Hunter Mark II None - Manual (Page 6)

CONTrOL FuNCTiONS
Power - Use to turn the detector on and
choose either of two search modes. A
battery check occurs automatically each
time the power is switched on. (Figure 1)
Threshold - Use to set the base audio
level according to an individual's hearing
ability and how loud the outside noise
is. Typically the sound is set no louder
than necessary, just above silent is
recommended. (Figure 1)

Figure 1, Panel Face