How do I turn the depth sounder off?
Press and hold the ON/OFF MODE keypad for 4 seconds to turn the depth sounder off. Pressing the ON/OFF MODE keypad again will reactivate the unit. Note that the internal LED lighting will remain on as long as power is supplied, even when the unit is turned off at the keypad. (Page 3)
From the official Faria Beede Is0091 manual, page 3
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