LG G5 ユーザーガイド

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Custom-designed Features
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A fingerprint may not be recognised properly if the surface of your 
finger has a scar or is not smooth due to being soaked in water.
If you bend your finger or use the fingertip only, your fingerprint 
may not be recognised. Make sure that your finger covers the entire 
surface of the Power/Lock key.
Scan only one finger for each registration. Scanning more than one 
finger may affect fingerprint registration and recognition.
The device may generate static eletricity if the surrounding air is dry. 
If the surrounding air is dry, avoid scanning fingerprints, or touch a 
metallic object such as a coin or key before scanning fingerprints to 
remove static electrictiy.
Registering fingerprints
You can register and save your fingerprint on the device to use 
fingerprint identification.
Tap     
Settings   General   Fingerprints & security   
Fingerprints.
To use this feature, make sure that screen lock is set. If a screen lock 
is not set, set the screen lock. See 
details.
Locate the Power/Lock key on the back of the device and gently put 
your finger on it to register the fingerprint.
Gently press the Power/Lock key so that the sensor can recognise your 
fingerprint. If you press the Power/Lock key with an excessive force, the 
screen lock function may start or the screen may be turned off.
Ensure that your fingertip covers the entire surface of the sensor of 
the Power/Lock key.