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Warm Tips ❤For detailed door lock installation and set-up instructions video, you can search for “ Nyboer N20 ” in utube , or contact the seller that go to email : [email protected] ❤To give you a better product experience, we recommend that you carefully read the parameters of the door lock before you order it and see if the lock fits your door. Simple Operation Add or remove users at any time, up to 200 users. 📌Extremely long battery life: 4 AAA batteries (not included in the box) for continuous use for half a year. 📌Reset button: Open the cover of the back panel handle,after install batteries, long press the “reset” button for 5s to activate the lock ,and the initialization is complete,and then start to set-up the door lock via App. 📌Add administrator: When the red and blue indicators are flashing, use the button to press the reset button, then press the fingerprint 3 times in succession while the red and blue indicators flash alternately. 📌Add users: Use the pin to press the reset button “ Di Di” 2 times (the red and blue lights are on at the same time). Then use the administrator's fingerprint to verify once, the red and blue lights flash alternately , and press the new fingerprint 3 times continuously. 📌Delete user: Use the pin to press the reset button and hold it for 5 seconds, then verify any registed fingerprint, and then it will delete all users. 📌Fingerprint unlock Press your finger on the fingerprint reader to unlock. Operation is successful: the buzzer beep once and blue light up; Operation is failed: the buzzer beep twice and red light up; Friendly Customer Service 📌 Providing with a one-year warranty from the date of purchase.