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3 In 1 Smart Door Lock: you will receive 1 smart door knob handles with 3 unlocking methods, including fingerprint unlocking, mobile app unlocking, key unlocking, they are ideal fingerprint door lock smart door knob for bedrooms, cloakrooms and offices hotelsSmart and Safe Technology: a button fingerprint door lock supports automatic unlocking of apps at close range, creating a smart living, semiconductor fingerprint sensor that can easily obtain fingerprint management, can accommodate up to 20 fingerprints, fast fingerprint recognition unlocking, at the same time, the app checks the unlocking records to protect your home securitySimple and Understandable Installation: no wiring, no drilling required, the smart door knobs handles installs easily with a screwdriver in minutes, fits most US doors, easily replaces existing door locks, there are detailed installation steps, you can set the channel or lock mode to meet the needs of various conditionsQuality Material: the keyless round door knob is made of quality aluminum alloy material, it is a comfortable, safe and reassuring material, which is clear, smooth and easy to clean, it can be applied for -25 to 70 degrees, and the lock body is more secureTips For Smart Door Locks: the smart entry door lock is only suitable for wooden and steel doors with a thickness of 35 mm to 54 mm, it requires 4 AAA batteries for installation and the power can be applied for about 9 months; There is also a low battery indicator and a USB interface for emergency power supply, but be careful not to charge the battery, please replace the battery in time if the battery is dead