Feature:1. Made of zinc alloy, it is and can be used for a long time.2. Safe and reliable, fingerprint identification lock, convenient fingerprint setting, safe.3. Easy-to-open fingerprint lock, the lock can recognize 30 fingerprints at the same time, and the recognition speed is 0.25 seconds.4. USB charging port, fingerprint door lock is powered by 4x dry AAA batteries (not included).5. Each fingerprint lock is equipped with 2 mechanical keys, allowing users to unlock using traditional methods.Specification:Item Type: Smart LockMaterial: Zinc AlloyWeight: Approx. 911g / 32.1ozColor: BlackPort: USB portBattery: 4xAAA Dry Battery (Not Included) Battery installation location, the rear handle, screwdriver can be installed to install the battery.Working Temperature: -20-55°CTime Recognition Time: 0.25sFingerprint Capacity: 30pcsAdjustable Center Distance: Maximum Approx. 70mm/7.76inDoor Lock Installation:1. Fix the spring bolt (C), pressure plate and buckle cover with self-tapping screws on the door where the corresponding hole is opened.2. Tighten the flat head screw (G) and the connecting pipe (H) to the front handle panel (A) in turn. Insert the square rod (F) into the square hole of the front handle (A) through the power cord.3. Install the front handle assembled with accessories on the door, square pole (F) and square hole, and pass the power cord through the spring bolt.4. Loosen the cover screw (B-1) of the rear handle (B), and then the battery box on the rear cover (B-2)5. Install the rear handle (B) on the door, and insert the power cord of the front handle and the square hole of the rear handle into the place where the square rod passes. Tig