Super detailed

Описание: Important correction: The battery compartment is still there, and you have to unscrew a knob that looks like a button to open it (I don’t understand why such an expensive device has not solved such a basic technical problem as the built-in lithium battery? Why is it still insisting on a very environmentally unfriendly and obsolete technology from 40 years ago!)
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AE-20: The most cost-effective investment. It has all the professional functions, but in the most professional fields, its functions are not as rich as those of AE-30.
AE-30: The high-end expansion functions are far more than all other models, and it is the choice of those top professionals.
AE-01 Mini: If your budget is really limited, or you really just want to buy a big toy for your own entertainment, and you don’t have high requirements for the final effect... then this basic model can also meet your requirements. It also has matching human-computer interactive teaching, which does not require any basic knowledge and ability. There is no difference from high-end products in this regard.
Other models are earlier versions and are not recommended.

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This is my second music-related video, detailing the entire unboxing process of the AE-20 I purchased.
The video includes the names and functions of each component.
In particular, I explain the various aspects and specific values ​​of the power supply system of this device in detail - which no one on the entire Internet has ever mentioned.
Please watch the video for details.
In the next video, I will explain in detail the specific functions of each hole and button on this electronic instrument.
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About the soundtrack:
Because the background sound is a bit noisy and meaningless, I replaced it all with background music.
The track is Beethoven's "Moonlight Sonata" in full. This is one of the best versions I know.
What is particularly valuable is that this is a "public domain" version contributed to the public for free by an American pianist. In this sense - especially for the United States where money is everything - this is a great man! Please remember his name: Paul Pitman.
See the link below for detailed information and sources.
（Because the music is longer than my video, I used clips from my other video to fill in the ending.）
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Music source:
https://musopen.org/music/2547-piano-...
Performer: Paul Pitman
This musician has put his performance on the above website and signed a relevant statement, making his performance enter the "intellectual/music property public domain" and no one/company can claim copyright.
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About copyright:
1. All videos and photos in my channel are taken by myself, and I own 100% copyright.
2. Currently, I only authorize direct playback through My YouTube channel. This authorization applies in all cases until I am amended.
3. Any form of editing, quotation, including video clips, audio or intercepted pictures is prohibited.
4. Do not authorize any form of transmission and storage other than direct playback on the YouTube platform.
5. If you have any intention to cooperate or purchase, please contact me through my published email address.