Garrett Metal Detectors Infinium LS - Manual (Page 13)

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Figure 15
CONTROL FUNCTIONS
Power
Used to turn on the detector and to choose slow,
lock or fast Automatic Ground Track. A battery check
occurs automatically each time the power is switched
on. (Figure 15.)
Audio Threshold Adjustment
Used to set the base audio level according to an
individual's hearing requirements. The Threshold
Adjustment may also be used to help mask outside
noise. Typically, the sound is set no louder than
necessary; just above silent is recommended. (Figure
15.)