ECHOMAP UHD 70/90 Front View Device Keys Introduction 3 Power key Automatic backlight sensor Touchscreen Shortcut keys microSD memory card slot Turns on and off the device when held. Opens a shortcut menu to backlight, color mode, and sonar transmission when quickly pressed and released. Scrolls through the brightness levels when pressed repeatedly. 1 2 3 4 Assigns a shortcut key to the active screen when held. Opens the assigned screen when pressed.