1、Cost-effective, it has most of the functions of a general smart door lock 2、No need to change your own door lock, economical and convenient 3、Full metal lock body, equivalent to a small safe, and it can store some necessary things 4、Forgot to bring the key, take out the trash, getting newspapers, the door was closed ? This is not a problem 5、New house renovation, just put a key in it, and you don't have to go back and forth Feature: Made with high quality metal for maximum durability. Cost-effective, it has most of the functions of a general smart door lock. No need to change your own door lock, economical and convenient. Full metal lock body, equivalent to a small safe, and it can store some necessary things. Forgot to bring the key, take out the trash, getting newspapers, the  door was closed ?This is not a problem! New house renovation, just put a key in it, and you don't have to go back and forth. Even if you do not put things, it is a nice decoration. Specification: Condition: Brand New Material: Metal Size: Approx 180*66*34mm/7.1*2.6*1.3in Color: As Picture Show Package Weight: Approx 577g Package List: 1 * Key Lock Box 1 * Screw 1 * User Manual Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.