This function allows the user to type in any number of random digits, and can still gain access as long as the 1 correct password is embedded. Create and delete access codes for trusted friends and family (100 codes and 100 fingerprints).Door thickness:45mm, wood or steel door. The size of the deadbolt is 50-55mm. Optical fingerprint reader is difficult to capture an clear dry fingerprint image, which results in that the product on the dry finger recognition rate is low (high rejection rate) and can not prevent false fingerprints to unlock, the safety factor is not high. Biological fingerprint has the faster recognition rate and higher recognition rate, it solve the problem of the dry fingerprint identification of optical fingerprint reader, to avoid false fingerprints can be unlocked, it has more higher security. Under this mode, You need use fingerprint and code to unlock, which is more safe than single unlock way:code or fingerprint. Our lock has more advanced codes input system that you can withdraw the wrong code when you input wrong number, so you do not need to enter the whole code again, it is more convenient. Security alert: If the wrong code entered 3 times, the lock will auto lock for 30 seconds and send out the alarm. Voice prompts: The Voice prompts will help lead you to operate the lock, set the unlock code and fingerprint, but if you think it is noise, you can also turn off this function. No More need to unlock frequently or worry about being locked outside when you are in full of hands, the lock will not auto lock itself, you need to turn the deadbolt to lock it. If you forget replace the battery, you can use one 9v Alkaline batteries to contact the emergency charging contacts to unlock. The item "Fingerprint Door Lock, Smart Lock Touchscreen Keypad Keyless Digital Door Lock" is in sale since Wednesday, March 7, 2018. This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Doors & Door Hardware\Door Locks & Lock Mechanisms". The seller is "plushome2016" and is located in , . This item can be shipped to North, South, or Latin America, all countries in continental Asia, United Kingdom, Germany, France, Australia.