A, can be used for multiple people to open the door (A home or office often more than one or two people), product quality should be stable, good performance;
B, can open the door with separate authority (it is impossible to let the householder, the nanny and the cleaner have the same authority to open the door)
C, can freely increase or decrease the fingerprint of the door (it is convenient to remove the fingerprint of the nanny after she leaves her job)
D, with some appropriate password function (this part actually don't need, because the fingerprint door already very safe, but the fingerprint is, after all, the electronic part may have bad, interim head of the household can open a door with password (password digits may not be less than 9 digits), in the choice as far as possible don't choose too highlight password function products, password as fingerprint safe after all. Usually there are 4 keys and 12 keys two kinds, the former can, the latter key code, will increase the possibility of bad points. Daily life as far as possible do not use the password to open the door, can effectively avoid being stolen, do not worry about the password is cracked, if someone wants to try out a four-key 11-digit password, will let him try to white beard)
E. Mechanical keys must be included, which is an alternate way to open the door. It is a safety consideration, just like airplanes and automobiles that have automatic control but still retain the manual control part.
Any electronic part has the possibility of error, relatively speaking, the mechanical part is much more stable, keep the mechanical key of the lock as a standby way to open the door at home, can open the door in time when the electronic part of the lock is wrong and convenient maintenance. What would you do if a fire broke out in your house, or if a thief failed to pick the lock and damaged the electronic part of your door? Don't go for psychological safety and opt for a door lock without a mechanical key. Demanded by national Ministry of Public Security, currently on the market most of the fingerprint lock mechanical keys are conspicuous position in the door, and it's easy to open, this is to prevent caused by the destruction of natural disasters or emergencies electronic part can't be used under the condition of normal use can be emergency safe passage, but the safe passage is sometimes easy to become a hidden trouble, Many customers may have such a question: with the mechanical key hole fingerprint lock is not much different from the mechanical key? Thieves with master keys or other means can still open the door from the gap ah! So in 2008, a professional fingerprint lock manufacturers in Shanghai launched such a fingerprint lock theft: Electronic parts under the condition of normal use, mechanical part in a "frozen" state, in the case of not to undermine the door, in any way is could not be opened, only in case of emergency or force majeure of natural disasters, the electronic part can't normal use, also need authorized party to form a complete set of machinery available keys to open, as a result, Users can rest easy.
F, choose the good lock. The stand or fall that locks core relates to your door directly to prevent pry sex and stability. This part is also very important, fingerprint lock is good again, ultimately still cannot leave the lock core part. Propaganda in the market is always fair and sound. The best is to refer to how to choose a manufacturer, choose a good manufacturer, listen to them. The fingerprint lock manufacturer that has strength under normal circumstances can choose oneself to produce lock core, come so product quality can be guaranteed certainly. So consumers in the purchase of fingerprint lock must first figure out their lock core is purchased or their own, this is a key point, the lock core in the lock inside the role of the heart of the lock, just think of a person if the heart has a problem can also go to where?
G, other fancy features are best not to. Basically not practical, more than one function more than a bad possibility, the product is broken after you repair is not repair, repair, maintenance personnel will charge you maintenance fee.