Samsung Galaxy S6 - Manual (Page 44)

Basics
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Emergency mode
Emergency mode changes the screen to grey tones to reduce battery consumption. Some
apps and functions will be restricted. In emergency mode, you can make an emergency call,
send your current location information to others, sound an emergency alarm, and more.
Press and hold the Power key, and then tap Emergency mode.
Add more apps to use.
Make an emergency call.
Remaining battery power and
usage time left
Turn on the flash.
Make a call. Send your current location
information in a message.
Browse the Internet.
Access additional options.
Sound alarms.
The usage time left shows the time remaining before the battery power runs
out. Usage time left may vary depending on your device settings and operating
conditions.
Deactivating emergency mode
To deactivate emergency mode, tap MORE → Disable Emergency mode. Alternatively, press
and hold the Power key, and then tap Emergency mode.