gain
switch: Long press the "Confirm" button for 1 second to realize the switch between automatic gain and manual gain
6.4 Menu key
Menu switching：Press the On/Off button while power-on, and the menu will appear on the screen.
The menu system of this product consists of three menu groups, namely: "Sonar" "Settings" "Advanced" (as shown
below), the user can press the on/off button switch between three menu groups or close menus.
In each menu group, users can use the left, right, or down arrow keys to select the menu item which need to be
modified, and use the left & right, or up & down arrow keys to change the settings of menu items. Once the Settings of
menu items appear on the screen, the system immediately performs operations based on the new Settings.
Save: Long press the On/Off button for 3 seconds in the startup state to automatically save the data set in the current
menu
Note: *** When the product is improperly installed or out of the detection range, the depth value will display
"0.0", lasting 5 minutes then automatic shutdown.
6.5 Power key
Start-up：Long press the "On"/" Off "button in the shutdown state for 3 seconds, and the product will start up. Then the
system will automatically enter the mode and set value selected before the last normal shutdown。
Shutdown：Long press the On/Off button for 3 seconds in the startup state, and then "Off" will be displayed.
Save: Long press the On/Off button for 3 seconds in the startup state to automatically save the data set in the current
menu.
Pause: When the machine is working, press the pause key to lock the screen; Press Pause again and the lock
screen can be restored.
7. Main interface display
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