Features: 【Smart Fingerprint Lock】Supports 40 sets of fingerprints (includes 1 administrator), fingerprint unlocking, more convenient for using. 【Fast Response】Adopts semiconductor fingerprint sensor and super CPU to increase processing speed and energy efficiency. 【Replaceable Battery】4 AAA batteries for long standby time and easy replacement. 【Hidden Key Hole】No need to worry about low battery, provides 2 mechanical keys for opening the door lock. 【Easy to Install】60/ 70mm adjustable latch, fits for various doors. Reversible handle for both right-handed door and left-handed doors. 【Reliable Quality】Made of high quality stainless steel and zinc alloy, firm and wear resistant, safe and reliable, durable to use. 【Wide Application】Suitable for both home and commercial use, such as bedroom, office, hotel, apartment, club, etc. Note: The function of voice control to unlock (compatible with Alexa/ Google Home) needs gateway (wi-fi), please refer to the user manual.