LG Stylo 3 User Manual page 9

Precautions for fingerprint recognition
Fingerprint recognition accuracy may decrease due to a number of
reasons. To maximize the recognition accuracy, check the following
before using the device.
The device' s Power/Lock key has a fingerprint sensor. Ensure that
the Power/Lock key is not damaged by a metallic object, such as
coin or key.
When water, dust or other foreign substance is on the Power/Lock
key or your finger, the fingerprint registration or recognition may
not work. Clean and dry your finger before using the fingerprint
sensor.
A fingerprint may not be recognized 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 recognized. 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 electricity if the surrounding air
is dry. If the surrounding air is dry, avoid scanning fingerprints,
or touch a metallic object, such as coin or key, to remove static
electricity before scanning fingerprints.
Custom-designed Features 8