The small advertisement asked the "locksmith" to install an "advanced" door lock cylinder.

　　On the evening of May 25th, Ms. Zhang, a citizen who lives in Xingbei New Town, jimei district, asked for help in unlocking service, because the key was left in the house, and Master Feng Chunbao came to provide unlocking and repairing service. Master Feng found that the door lock of Ms. Zhang’s house is not the advanced lock core she said, but an ordinary lock core with very general anti-theft performance. As a result, it took Master Feng less than one minute to unlock the big door of Ms. Zhang’s house, which surprised Ms. Zhang greatly.

　　Only then did Ms. Zhang know that it was a "black-hearted" locksmith who replaced the lock core at home before, and what she replaced was just an ordinary lock core. The normal market price was 80 to 100 yuan, and the most terrible thing was that the anti-theft performance was very poor.

　　"Black-hearted" locksmith unlocks and repairs locks, shoddy.

　　It turned out that this "black-hearted" locksmith was "summoned" by a small advertisement when Ms. Zhang forgot her key six months ago. As a result, the locksmith who came to the door always stressed that it was necessary to pry the lock to open it, and that a lock core should be replaced after the lock was pried open, and recommended the lock core with "advanced" and "good anti-theft performance" to Ms. Zhang, and accepted 360 yuan. Today, the contact number of this locksmith has not been answered.

　　The police will help you.

　　★ How to choose a lock core with good quality and anti-theft performance?

　　At present, household door locks are generally divided into three levels:

　　First, grade A, the qualification standard is that the technology has been on for more than 1 minute.

　　Second, class B, the qualification standard is that the technology has been on for more than 5 minutes.

　　Three, super B level, to be unable to open the technology or technology for more than 270 minutes as the standard.

　　Police reminder

　　★ The citizens should be cautious when asking for help in unlocking service, and do not contact the wall advertising information of unknown origin (that is, the unlocking phone in the psoriasis advertisement mentioned above).

　　★ According to the police, there are three main security risks: ① The other party is fooling people, and the more people don’t understand, the more likely they are to be overcharged, and they often take the way of destroying the lock core and replacing the lock body to meet their personal interests; ② The person who unlocked the lock was not put on record, his identity information was unknown, and there was no uniform clothing and work card for the masses to identify, so it was difficult to find it afterwards; (3) individual social locksmiths with ulterior motives are working as locksmiths today.