Fitnate Smart Fingerprint Door Lock is formed of metal material, sturdy and durable in use. With chromium coating design of outer appearance and skidproof feature, it can highly reduce the possibility of chemical reactions like mechanical wear and chemical corrosion. It’s very easy to install. Waterproof seals protect electronic components. There is a wide range of applications of this smart lock and it can be widely used in all kinds of doors of different materials. For instance, wooden doors, metal doors, glass doors, stainless-steel doors, and so on. You could Unlock Remotely Via Wifi while you are not at home. It also Supports With Amazon Echo/Echo Dot Smart Speaker.