In less than half an hour, Li Zhao rushed over, in fact, he did not go far, at such a critical moment, he went out after sending the emperor here, the purpose was to let Wuquan pay close attention to the movements and suspicious things of the army and the head of Qian.

"Your Majesty, Zhao is here, I don't know what to look for?"

Li Zhao is not outside, at the moment he really doesn't want to waste time serving the emperor, things are confusing outside, he has to think about it and take a good look to ensure the smooth progress of tomorrow's grand event.

"It's nothing, I just want to ask if you have something that can deliver messages over long distances."

He didn't mention anything about the conspiracy of the villains, as if he didn't care at all.

Something that delivers messages over long distances? Hey! Of course, there is, the mobile phone in the previous life, not to mention the long distance, even if it crosses the entire earth, he can naturally buy it at this moment, but he can't buy the signal system.

The mobile phone needs a satellite connection to connect, where is he going to get a satellite?

Of course, in addition to mobile phones, there are also some that can receive messages from a distance, such as telegrams, such as walkie-talkies.

There is also a corded telephone.

The telegraph belonged to the obsolete things of the previous society, but it still played a great role in the old society, but the telegraph operation process was too difficult and required professionals, where did he get it? Even if it is re-cultivated, it will take some time.

As for the walkie-talkie, it is ready to use, convenient and fast, but the problem is that it will not work if it is too far away.

The most direct and effective is the corded telephone, but the installation of the telephone line is a big project, and it is really difficult to get it for a while.

Each has its own pros and cons.

Of course, there is also a way to fly the pigeon to pass the book, at this moment Daqin has not yet passed the pigeon, naturally I don't know the use of the flying pigeon, in fact, the flying pigeon is also a good way, that is, where to get this carrier pigeon? Li Zhao hasn't seen a flying pigeon so far, maybe he hasn't paid attention!

He thought of the department store, but since he got the department store, he had never bought an animal from it, so he didn't know if it would work, and of course, it was better to buy a flying pigeon than to use a wireless telephone, which was much more practical than that.

Li Zhao was embarrassed, he didn't know whether to answer yes or no, but he had to answer, so he had to ask again: "How far is the distance?" ”

As far as I know in the previous life, the communication distance of the general walkie-talkie is within two to three kilometers, the professional walkie-talkie is within three to ten kilometers, and the commercial walkie-talkie is within eight kilometers.

These walkie-talkies should be available in department stores, but I don't know what the price is, of course, he also has to ask about the distance, if the distance to communicate is more than ten kilometers, the walkie-talkie does not need to be considered.

In fact, a wired phone is the best way to communicate, and if he has enough time, he still wants to say a wired phone.

"The farther away the better, of course! The more secretive, the better. ”

Li Zhao shook his head when he heard this, this is equivalent to not saying it, everyone knows that the farther away the better, but what he needs is the exact distance, so he can make a choice.

However, as soon as I heard the latter sentence, 'the more secret, the better', I had a plan in my heart.

Although the wired telephone is good, it can't be hidden, flying pigeons is not bad, there is a risk in stealth, walkie-talkies can do it, but distance is a problem.

"How about within twenty miles?"

The professional walkie-talkie can reach ten kilometers, that is, twenty miles, and if this distance is possible, he is still willing to help.

"Twenty miles?" Ying Zheng understood the 'twenty', but he didn't know what the 'inside' was.

At this time, there was no concept of 'inside'.

Li Zhao secretly patted his head, secretly blaming himself for forgetting that he was in Daqin at the moment.

The length unit of Daqin is very simple, it is nothing more than an inch and a foot of citation, and all of them are decimal systems, and ten kilometers is more than 30,000 citations.

"That's more than 30,000 citations."

"More than 30,000 citations? Foot also! ”

"However, if there is one thing, it can deliver a message at this distance."

"Oh!" Ying Zheng was surprised, "But what is it?" Is it secretive? ”

(End of chapter)