Li Anping was wondering if the people who connected with Cao Ruofei were so cunning and cautious, and people like Li Lifeng were only worthy of being Cao Ruofei's downline.

Li Anping remembered Cao Ruofei's secret room, and he couldn't help but look around the teaching and research room again, this teaching and research room is not big, it is simple, there is no secret room, cubicle, there is not even an extra cabinet, the furniture is only two desks and two chairs.

Li Anping, who was thinking hard, still focused his eyes on Chen Xiao's desk, he swept around unconsciously, and suddenly he noticed something strange: the electric soldering iron shelf.

This soldering iron shelf is no different from an ordinary soldering iron shelf at a glance, but there are many doubts on a closer look.

First of all, there are no traces of the metal rod of the soldering iron on the bracket and the wooden base at all; Secondly, there are several protruding tin on the wooden base, which look like they were left by welding, but Li Anping looked down and found that there was a hole in the center of these tin blocks, and there were six such tin blocks, four on the wood base and two on the side of the base.

Li Anping also saw that there was a coil on the side of the wooden base of the shelf, and there was a wire at the other end of the coil.

In addition, there are several diodes and a small iron cylinder with two metal wires welded to the soldering iron shelf.

Li Anping reached out and touched the bracket of the soldering iron shelf, and the bracket was pressed down with a slight afterburner.

This bracket is not made of hard wire, but of iron sheets with good toughness.

Li Anping looked at the wooden base, and then looked at the components on the side, the length of the diode was about the same distance as the distance between the two tin blocks on the wood base, and the distance between the two wires on the iron cylinder was about the same as the distance between the other two tin blocks on the base. He picked up the diode, and it was easily attached to the two tins, and then to the tiny cylinder, and then to the coil.

Li Anping pressed the bracket again, and the bracket was overwhelmed on the wooden base, and then a rapid beep sounded. Li Anping was so frightened by this buzz that he almost wanted to run away, but quickly calmed down again, the sound was not loud, and it was impossible to hear it even next door during class.

Li Anping was stunned, plus an antenna, isn't this soldering iron rack a simple intelligence receiver?

The antenna could easily be put away somewhere, in the drawer and elsewhere he had already checked, and nothing looked like an antenna.

If he were Chen Xiao, where would he put the antenna, or disguise it as something? Could it be hidden in some component? Li Anping unscrewed every element on the table a few times, and there was nothing abnormal.

Pen? Could it be a pen holder?

Li Anping went to check the pen holder again, and there was nothing abnormal, except for a few pens inside. It is entirely possible that the antenna was hidden in one of the pens, and he unscrewed the pens one by one.

Sure enough, two pens were empty, one with a retractable metal tube and one with a soft metal wire.

Needless to say, that's the antenna!

This Chen Xiao monopolizes the physics teaching and research department, and during class, he can send and receive information at will as long as he closes the door.

In case someone comes in, when someone knocks on the door, he will take something in his hand and cover it up a little, or even if he doesn't cover it up, it will be difficult to arouse the suspicion of others. No wonder he has been following Chen Xiao for so long, except for him to go to the joint, he has never seen him do anything else at night, it turns out that he did it between classes.

Even with this evidence, it is inconvenient for Li Anping to arrest Chen Xiao in school in broad daylight, he is now just a public security officer of a prostitute reform team on vacation, not a public security officer who arrests spies.

Besides, if the arrest does not go well, it is difficult to say that Chen Xiao's extreme actions will not threaten the safety of the school's teachers and students. After a little contemplation, Li Anping thought of a way to easily catch Chen Xiao and present his evidence.

Just as Li Anping was about to leave, he found a note next to the iron shelf, and saw that the note read:

1333817--1233

247654--32117

Li Anping looked at it, and was afraid that he would not be able to remember, so he still wrote it down with a pen and paper......

What does this set of numbers represent, and it didn't give him more time to think about it, Li Anping had to return everything to the way it was before the class bell rang, immediately quit the physics teaching and research room, locked the door again, Li Anping left the school and went straight to Chen Xiao's home.

Li Anping found an opportunity when no one was around, opened Chen Xiao's door and slipped in, preparing to ambush Chen Xiao's house, and when he got home, he would knock him down with a stick from behind the door.

It was still early for Chen Xiao to get out of school, and Li Anping searched Chen Xiao's room, but there was no trace of being a spy.

He said in his heart that it was fortunate that he didn't rashly search Chen Xiao's room as an official when he was in the spy inspection team, otherwise he wouldn't be able to find evidence and wouldn't say anything.

It is clear that these agents have been prepared for a long time......

Li Anping found a pen and paper and wrote a few lines, mentioning that Chen Xiao was a physics teacher at a certain school and had a simple information transmitter in his office.

Li Anping folded the paper and put it on his body, found a wooden stick, and waited for Chen Xiao to come back in the room.

Li Anping waited left and right, but he couldn't wait for Chen Xiao to go home, and the sky outside the window was already dark.

Li Anping became anxious, could it be that Chen Xiao was aware, but it shouldn't be, he was the only one involved in the whole operation, and he could confirm that he had not exposed his whereabouts and purpose.

Taking a step back, even if Chen Xiao knew that someone was inquiring about him at school, at most it would only arouse his vigilance, and he would not go home.

Chen Xiao is a local and has never been married, his parents arranged a family affair for him, and he went on a blind date after school.

After the blind date, Chen Xiao sent the woman home out of etiquette before turning around and going home. After this toss, the soles of his feet ached, and he walked to the door very late.

Li Anping, who was hiding in Chen Xiao's house, heard footsteps from a distance, so he immediately got ready, copied a wooden stick and hid behind the door.

The footsteps were heavy, getting closer and closer to the door until they stopped.

Then, Li Anping heard the sound of pulling out the key, this time it must be Chen Xiao, he held his breath.

Chen Xiao didn't realize that danger was coming, he opened the door, dragged his tired body, and just kicked the door shut with his foot, and before he could turn on the light, he felt a heavy blow to the back of his head, his mind was dizzy, and he immediately lost consciousness.

Li Anping took out the rope he had prepared earlier and tied Chen Xiao up, and just when he tied Chen Xiao, he suddenly thought of something.

So, he found a knife, cut open one of Chen Xiao's clothes, blindfolded Chen Xiao's eyes with a piece of cloth, and plugged Chen Xiao's mouth with a ball of cloth......