"How do you know?"

Upon hearing Yan Yi's surprised response, Shang Lingyi and Le Yu did not show any expression of joy; instead, they both furrowed their brows slightly.

Yan Yi opened up the instrument on the table and took out two metal badges—Le Yu almost wanted to smack himself on the head, the technology theft was lacking, he actually forgot such an obvious trick!

In the memories of Zhengwei and Yin Yinyin, they had seen countless wealthy individuals intentionally hide good things in obvious places. They initially didn't realize this trick either. But they didn't miss much good stuff, as the two of them treated killing like eating, and facing death crises, the terrified wealthy often revealed everything. No matter how well it was hidden, it inevitably became the spoils of piano nocturnal demons and the white-haired assassin.

Perhaps because Zhengwei and Yin Yinyin were used to "pressing 'F' for forced search," they never followed a technical route. Consequently, while Le Yu vaguely felt the instrument on the desktop was somewhat 'large', he didn't realize it was the perfect hiding box, hence he missed it.

Seeing Yan Yi tapping the two metal badges, she said, "This is the communication tool we've developed, temporarily named 'Heart Resonance'. On bright sunny days, the maximum communication range is five miles, on cloudy days only two miles, and at night it is reduced to within a hundred feet. Each use requires placement in sunlight to charge for three hours, and each use allows for a maximum communication of ten minutes. The communication quality depends on the distance; when using, lips must be close to the badge, activation is by forcefully tapping the surface, which makes the Heart Resonance start working."

"But the sound will definitely be severely distorted, for example..." Yan Yi placed one badge close to her lips, handed another badge to Shang Lingyi, then spoke in a low voice, and the badge in Shang Lingyi's hand emitted a sound akin to the rasping of machinery.

"A very nice little gadget." Lou Yinhai adjusted his sunglasses and nodded, "Alright, let's skip this boring topic. Teacher Yan, let's continue discussing the modulation and demodulation of radio signals."

"Teacher Yan, how many pairs of these have you manufactured?" Shang Lingyi asked, "What I mean is, if this product can be mass-produced, it will inevitably have an indelible impact on Yanjing... no, on the whole of Huiyao."

"Very good, very good, it seems like what you're discussing is quite important." Lou Yinhai shrugged and stepped back a bit, lowered his voice, muttering to himself yet audible to everyone in the laboratory, "I knew letting the stench of copper pollute academia would lead to this kind of outcome..."

Yan Yi glanced at Shang Lingyi, gently tapped her jade finger on the table, glanced at the cabinet, rolled her eyes, and said, "Our research lab made five pairs, the first two pairs were directly scrapped due to excessive testing. This pair is what we have left for testing... but it's completely unsuitable for mass production."

"Heart Resonance is more a creation of Luminous Stone Alchemy rather than the product of our radio group research. Compared to the highest crystallization of Luminous Stone Alchemy—the Divine Weapon—a mere radio communication function is too insignificant. We have many challenges to overcome to reach a truly usable radio communication tool, requiring many theoretical calculations, but with the aid of Luminous Stone Alchemy, we can use spiritual power to directly reach the last step and then insert the desired function into the Luminous Stone creations..."

Yan Yi put the metal badges back into the instrument, talking while walking, "It's more like a toy made under the high expenditure of Luminous Stone Alchemy... even disregarding labor costs, the production cost of each pair of Heart Resonance exceeds twenty gold coins."

Shang Lingyi was stunned, "So expensive?"

"Meteorite brilliance dust?" Lou Yinhai said with certainty.

Upon hearing this, Le Yu also understood why this thing was so expensive.

This meteorite brilliance dust is the main material of the Eight Illusion Divine Weapon.

Unlike the time when he was clueless and despised by Yin Yinyin, Le Yu, during his tenure as the president of Zhengwei, collected considerable information about divine weapons. Although little was known at the grassroots level, there were always poetic records among wealthy families. When Le Yu went to blackmail the Wanghai Mansion, aside from obtaining the unwed fiancée Huyan Silo, he acquired many classic books of 'Huiyao Secrets'.

In this world of ores, gold, silver, copper, and iron can only be considered add-ons, while Luminous Stone is the foundation of all things. Above Luminous Stone, there are two major ores: one is Meteorite Luminite, supposedly the main material of Absolute Divine Weapon, but according to internal records of Huiyao's four guards, Meteorite Luminite is actually artificial; we'll leave that aside for now. The other major ore is meteorite brilliance dust.

It's essentially meteorite, but not all meteorites are meteorite brilliance dust; at least those scorched by the sun and directly transformed into Luminous Stone in space can be considered.

If judged by 'amount received of sunlight radiation', ordinary Luminous Stone rates a 1, while meteorite brilliance dust rates at least 100. However, its rarity rates at least 10000—this thing is sold by the gram and is often out of the market.

Yet as the best carrier of spiritual power, if ordinary Luminous Stone allows your spiritual power to freely play Minesweeper, meteorite brilliance dust lets you directly play Monster Hunter World Iceborne—the latter allows you to possess the ability to twist reality.

As Yan Yi mentioned, if legitimately making a radio communication tool, they still have many unresolved issues. But with the use of meteorite brilliance dust, they directly 'imported' the radio communication feature, and the metal badge 'read' their wishes and 'generated' this feature.

'I think this will work', and then it really did.

It's conceivable that meteorite brilliance dust is so much in demand, so expensive. That pair of metal badges costing twenty gold coins is not exaggerated at all.

"Where are the other two pairs of Heart Resonance?" Shang Lingyi asked a question Le Yu wanted answered, "If possible, I plan to buy a pair to take back for the elders to see; it should also lead them to increase investment amounts..."

"One pair was taken by Principal Cha, taken without paying since the meteorite brilliance dust was something he helped provide." On this topic, Yan Yi also displayed a wry smile, "And the other pair was sold."

"Sold to whom?" Shang Lingyi asked eagerly, but quickly corrected, "I can negotiate with the buyer, maybe they are willing to sell it to me."

Yan Yi faced away from the cabinet, shaking her head, "Don't know."

"Don't know?"

"The person came to me wearing a mask and cloak, spoke using Combat Technique, claiming to have been introduced by Principal Cha Huan, but I felt that wasn't the case... however, if tea Huanist's intelligence was leaked, I would believe that."

"And yet you sold it?" Shang Lingyi asked.

"Because the person offered a price I couldn't refuse."

"What price?"

Yan Yi smiled, remaining silent, and Shang Lingyi knew her stance, immediately said, "Can I see Heart Resonance?"

"No problem, as long as you don't take it out, you can freely test it in the lab."

Seeing Shang Lingyi go over to fiddle with the metal badges while Lou Yinhai, who had been impatiently shaking his legs on the side, finally perked up, "Our time is extremely valuable and shouldn't be wasted on trivial socializing. Teacher Yan, I think the practical significance of modulation is shifting the signal's spectrum to allow the receiver to separate the needed frequency signal, so signals of different spectrums avoid interference with each other..."

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