Digital door lock: There is only one set of passwords and the numbers cannot be repeated. The recommended password is 4 to 6 digits. For example, if the password 123456 is set to 231456, it can be opened and enjoy the convenience and peace of mind of keyless entry and exit. Mechanical lock without battery: The mechanical door lock does not need a battery or power source at all, so you don't have to worry about low battery, there is no risk of "low battery", programming terrible or random alarm, which is more reassuring Wide range of uses: suitable for office doors, interior doors, rental doors, composite doors or places that are not suitable for keys. With screw kit and English manual, easy to install, suitable for interior and exterior doors Waterproof material door lock: The mechanical button lock is made of high quality zinc alloy, which is strong, precise, safe, durable, waterproof and not easy to break, and has a long service life