1. Handle style Smart Lock The unlocking method of the handheld smart lock is closest to that of a mechanical lock, which requires pressing the handle to unlock. The handle type smart lock is generally a semi-automatic smart lock. After verification, users need to rotate the handle themselves to open and lock the door.
2. Push-pull smart lock
The push pull smart lock, as the name suggests, is unlocked through push pull. It is generally a fully automatic smart lock. After verification, the door lock will be automatically opened, and after closing the door, it will be automatically locked. Users only need to push and pull to complete the unlocking and locking process. 
3. Password lock Password locks were also the most common form of unlocking early smart locks, where users only need to enter a password to unlock. 4. Fingerprint lock
Fingerprint locks have become the most popular smart locks on the market due to various factors such as stable prices and high cost-effectiveness. Fingerprint recognition technology is divided into semiconductor fingerprint recognition and optical fingerprint recognition technology. The vast majority of fingerprint locks on the market now use semiconductor fingerprint recognition technology. (Optical fingerprint recognition has been phased out in the market due to its high replicability and low security.) However, when faced with fingerprint damaged populations, as well as elderly and children with blurred/shallow fingerprints, fingerprint locks are often difficult to identify. 5. Face recognition intelligent lock The current facial recognition technologies on the market include 2D facial recognition technology and 3D facial recognition technology. However, due to the lower security of the former, mainstream brands generally use 3D facial recognition technology. 3D facial recognition technology is based on the principle of triangulation to calculate the depth information of the face and determine whether the face matches, thereby verifying and unlocking. With the continuous development of technology and the Internet of Things, the application of facial recognition technology in the field of smart locks is gradually maturing and becoming the mainstream trend of smart locks. 6. Iris recognition lock The principle of iris recognition is to recognize the circular part between the black pupil and the white sclera on the surface of the human eye, which contains many interlaced details such as spots, filaments, coronas, stripes, and dimples. The iris is the only internal organ that can be seen from the outside, which is not worn out and has uniqueness. Therefore, in general, the iris can become the only biometric feature that identifies an individual.
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