The tutorial of Altman lighting is as follows:

Experimental equipment:

Standard cup, enameled wire, LED and mobile phone.

Experimental process:

First, the enameled wire is wound into a multi-turn coil.

it is necessary to have enough turns before the experiment can be successful.

then connect the LEDs to both ends of the coil.

next, turn on the NFC function of the phone.

finally, put the coil in the NFC sensing area behind the phone, and you can see the flickering light.

Principle explanation:

Why does the "Otto indicator light" on Altman's chest blink? Why can Altman contact the Otto brothers by launching Otto's signature? These problems have plagued Xiaobian since childhood.

after this experiment, we can make a bold guess about these problems-there may be a large electromagnetic wave transmitter inside Altman.

The "Otto indicator light" on Altman's chest is likely to have a similar structure to our experimental device. The "OTT indicator lamp" is connected with a closed "OTT coil" and an "OTT sound" is connected in parallel.

after fierce fighting with monsters, Altman's energy is consumed greatly. When the energy is less than 2%, Altman enters the energy-saving mode. In the energy-saving mode, Altman will turn on the "Otto mobile phone" in the body and start emitting alternating electromagnetic signals (similar to turning on the NFC function of the mobile phone in the experiment), so that he can prepare to send a distress signal while saving his strength.

according to Faraday's law of electromagnetic induction, an alternating electromagnetic signal will excite an induced electric field in its surrounding space, which will generate an induced electromotive force in the Ott coil. Because the change rate of alternating magnetic field is periodic, so is the induced electromotive force.

therefore, the brightness of the "Otto indicator lamp" will change periodically under the driving of the periodically changing electromotive force, and at the same time, the parallel "Otto audio" will ring "beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep

Otto signature:

Based on such a conjecture, we can speculate that Altman's "Otto signature" should also be an electromagnetic signal. As we all know, electromagnetic waves can travel in a vacuum, so they can be used for interstellar communication. Altman may have made use of this principle and formulated a set of "OTT Communication/OTT Network Protocol".

whenever Altman is in danger, they will encrypt their position information and the monster information they face, load them into electromagnetic wave signals, and finally send them out in the form of Otto's signature, calling their Otto brothers: "Brothers, come and help me!"