LG LGL39C - Manual (Page 80)

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< PC connection >
USB connection type – Set the default mode used when connecting the phone to
a PC via a USB cable. Choose from Charge only, Media sync (MTP), or Camera
(PTP).
Ask on connection – Checkmark to confirm the USB connection type when you
connect to a PC.
Help – Displays connection settings information.
< Developer options >
Keep in mind that turning on these developer settings may result in irregular device
behavior. The developer options are recommended only for advanced users.
Take bug report – This will collect information about your current device state, to
send as an email message.
Desktop backup password – Sets a password to back up the desktop.
Stay awake – Checkmark to set the screen to never timeout while charging.
Protect SD card – Checkmark to protect the microSD card. When the microSD card
is protected, applications must request permission to read data from external storage.
DEBUGGING
USB debugging – Checkmark to turn on debug mode when USB is connected.
Allow mock locations – Checkmark to set the device to a mock location.
Select debug app – Allows you to select the debugging application.
Wait for debugger – Checkmark to wait for debugger. Debugged application waits
for debugger to attach before executing.