After school that day, Qin Hongfei went straight to Xia Shangxu's rental house. Qin Yun and Qin Fei knew that they were going to see their cousin, so they followed.

The old lady downstairs saw Qin Hongfei this time and took the initiative to say, "Your cousin hasn't come back these days, there's no movement!"

Qin Hongfei thanked her.

Then she went to the door of the rental house and saw that the door handle was covered with dust.

How could a living person disappear? She didn't believe it.

Concubine Qin said, "Hongpin, I went to my aunt's grandmother's place, but I didn't dare to go in. But I asked the neighbors and found out that my cousin had a quarrel with his family." Qin Yun

said puzzledly, "Why did my cousin quarrel so much that he disappeared? It's not a big deal. I was beaten by my parents and it was okay."

Qin Hongpin looked around the geographical location, then took off her schoolbag and searched inside, and then found what she wanted, "Help me watch the schoolbag, wait for me here."

Qin Yun was very interested, "Hongpin, what is this?"

Qin Hongpin was holding a pair of glasses in her hand, and a headset was connected with a beeping sound. She said, "Telescope plus life sign detector!"

Qin Yun and Concubine Qin were confused by the high-end name.

Qin Hongpin simply tried it for them to see.

There was someone at home next door. She walked over and stuck the sensor on the door, then showed the instrument in her hand to Qin Yun. The amplitude of the dripping sound became louder, and then the curve on it changed. Qin Hongfei said, "Everyone has a heartbeat, and the heartbeat will generate an electric field generated by subwoofer waves. When the sensor is attached, if there is someone inside, it will be reflected on the instrument..." She pointed to the curve and said, "Do you understand?" It

's very easy to understand. If you don't understand, then don't try to understand.

Anyway, it's okay as long as you can use it.

Qin Hongfei first went to the grandmother opposite to get her consent and entered the roof, then looked directly into the house through the glass above the door through a telescope. If someone was also looking at something, they would definitely be surprised!

Unlike ordinary telescopes, this one showed red curves in Qin Hongfei's eyes, that is, everything she saw was made of red structures, including the door and the things in the house, confirming what she wanted to confirm.

Qin Hongfei looked down at the instrument! Coming down from the roof, she went straight back to the door of the rental house and said affirmatively, "My cousin is hiding in the house."

Qin Yun and Qin Fei were dumbfounded, "But didn't the grandma downstairs say that she hadn't seen him for a long time."

Qin Hongfei said, "What if he hasn't gone out these few days!" She believed that her equipment would not go wrong.

Qin Yun also thought it was possible, and said excitedly, "I'll knock on the door."

Qin Hongfei had no time to stop her, and after a few knocks, no one opened the door. Instead, the neighbor came out and shouted dissatisfiedly, "Stop making noise."

The three apologized, and Qin Hongfei searched on the ground and found a steel wire, then put the wire into the keyhole. Qin Yun laughed at her mercilessly, "Hongfei, you've watched too much TV, how is this thing possible..."

With a "click", Qin Hongfei heard the movement and opened the door directly, threw away the steel wire, then turned to look at him, clapped her hands and looked at the two dull faces, and said calmly, "As long as you learn enough, the impossible can become possible! "

..."

Qin Yun: "..."

??? You

can open this, is it true?

How can you know everything? You have