6 Ways To Unlock Advanced 6-in-1 Keyless Entry Smart Door Lock: Fingerprint + Anti-peep virtual password + Smart phone App + Physical Key(2 include) Remote control, Voice control. One Touch Fingerprint Access,read your fingerprint, and unlock your door.It can auto relock your door for you so your home is always safe. Easy to Install The smart fingerprint door lock is super easy to install. Adjustable deadbolt size: 2-3/8'(60mm) or 2-3/4'(70mm), It is suitable for the Door thickness of 1-3/8' to 2-1/8' (35 to 55mm) and Door hole diameter 2-1/8'(54mm). Simple Door Handle settings,suitable for various scenarios, replaces standard single-cylinder door locks, fits both left and right, inner and outer. Easy to install in minutes by following short installation video. High Security and High durable The Smart lock is made of zinc alloy material, much heavy than others lock at the market, durable for a long time use, anti-corrosion, sleek and modern, also the body with high quality electrical plate, it has a simple, stylish bold look. It is ideal for home office, apartment, garage entrance door, storage room, warehouse, basement, bedroom, etc. USB + Backup key Double Assurance Low battery alarm on App (Tuya/Smartlife),with emergency power interface and backup key.When the power is critically low or the batterypls note: 4xAAA batteries not include with lock) is completely drained,don't worry,use the backup key to open the door,micro USB power bank also can be a temporary power supply. Never Be locked Out.Remote control & voice control The smart fingerprint door lock handle supports IOS and Android devices. with the free Tuya smart App to choose, Paired with Bluetooth Tuya Gateway. you can lock/unlock your smart door lock by app or voice .anywhere anytime,set up codes remotely and check real-time access logs.