LG Stylo 2 Plus LG-K550 - Manual (Page 16)

Features you will love 15
Fingerprints
The Fingerprint feature allows you to place a finger on the Power/Lock
Key to unlock the screen or see locked content.
Registering your fingerprint
1 Tap > > General tab > Fingerprints & security > Fingerprints.
2 You need to set a secure screen lock before registering your fingerprints.
The lock will be used as an alternative method for fingerprints.
3 Place your finger on the Power/Lock Key.
4 Lift your finger when the device vibrates and then place it on the
Power/Lock Key again. Repeat this action using the same finger until
the fingerprint is registered.
NOTE
Ţ Make sure that your fingers and the Power/Lock Key are clean and dry.
Ţ Moisture, lotions, sweat, oils, cut or dry skin might affect fingerprint
recognition. Certain activities can also temporarily affect fingerprint
recognition, including exercising, showering, swimming, cooking or other
conditions or changes that affect your fingerprint.
Ţ Cover the Power/lock Key completely. Don't press it too quickly or move your
finger while it is scanning.
Ţ As you use the fingerprint, the device will continue to learn and improve
recognition of your fingerprint.