Thank you for understanding! So please rest assured to do shopping in our shop Simplified Safety. Your fingerprint is unique to you, making for the utmost security. It uses the semiconductor biometric fingerprint technology that prevents duplicate fingerprints happen. This digital door lock is built with weather proofed zinc alloy and designed to withstand the elements. Swing the handle up to turn the privacy deadbolt to double lock push the handle down to open the door pls noted this can be locked automatically after you close the door. Powered by 4pcs AAA 1.5V batteries which can be lasted for about 1 year. Batteries are located at the front panel so you can easily change the batteries from the outside door. 1Hidden Mechanical Key Hole emergency key to open the door if you do not want yo use fingerprint or the battery is dead. 2Batteries Is Located At The Front Panel so you can change the batteries from outside door 3Zinc Alloy Handle &Stainless Steel Panel color will not fade in 10 yearsanti-corrosion 4One Touch Access Fingerprint scanner will wake automatically once you place your finger on it and is conveniently positioned to accompany your natural hand position. One seamless action allows you to wake the lock, read your fingerprint, and unlock your door. The whole unlock action takes only 1 second. It can auto relock your door for you so your home is always safe. Please see below drawing Here are two types of mortise When you place your order, pls let us know which one do you need. How to determine whether the lock fits your door or not? (1)Measure door thickness; (2)Measure the length of the guide plate; (3)Measure the width of the guide plate. If you are not sure whether it can replace your old lock or not, please contact and tell us the details of it directly! The item “FREE DHL Waterproof Aluminum Glass Door Lock Fingerprint Smart Door Lock” is in sale since Friday, December 6, 2019. This item is in the category “Home & Garden\Home Improvement\Building & Hardware\Doors & Door Hardware\Door Locks & Lock Mechanisms”. The seller is “supernovastore” and is located in guangzhou. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.