Frequently Asked Question: How to do if the fingerprint can't be identified? Usually due to fingerprint wear, peeling, scratches, dirty, wet , or fingerprint collection window with smudginess and water droplets, fingerprint identification is not successful. It is necessary to the and fingerprint window are clean and dry . In case of finger scratches, it is recommended to enter at least 3 fingerprints registration after purchase.How many fingerprints can be registered? 10 fingerprints can be registered .How to do if the battery is dead? Connect the charging port with -USB, the red light is on, indicating it is charging, and it can be unlocked normally during charging. The light is off, indicating it is fully charged.How long does it continue after being fully charged? After being fully charged, it can stand by for 12 months, and when the is low, the red light flashes after unlocking.Any fingerprint can be unlocked. When the fingerprint is not recorded, any fingerprint can be unlocked. If fingerprints are recorded, only the recorded fingerprints can be used to unlock the lock. Therefore, under normal circumstances, you must record more than two fingerprints to prevent the embarrassing situation of the being scratched and unable to unlock.Cannot unlock when the battery is exhausted. When the fingerprint is not recorded, any fingerprint can be unlocked. If fingerprints are recorded, only the recorded fingerprints can be used to unlock the lock. Therefore, under normal circumstances, you must record more than two fingerprints to prevent the embarrassing situation of the being scratched and unable to unlock.Colour: BlackMaterial: zinc alloyPackage Contents:1 x fingerprint padlock1 x USB cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.