Notes on AI, tools, and tech.
A plain-English notebook on what works, what you can buy, and where the catches are.
A UL logo on a Chinese e-bike listing costs the seller nothing to add. The file number behind that logo is what costs money, and you can check it yourself in about two minutes. The standard you want is UL 2849. It covers the whole electrical system. The battery, the charger and the controller, tested … Read more
Kuaishou says Kling 4.0 goes live in October. The company announced the model on September 28 and opened a limited early build of Kling 4.0 Flash the same day. Two numbers lead the release. Clips get twice as long. The top output format picks up high dynamic range. The list matters less than which parts … Read more
Buy a Chinese phone in Shenzhen and fly it to Texas, and you moved the phone without moving the warranty. Coverage follows the country where you paid, not the brand on the back. Most people learn this the expensive way. Something breaks in month nine. They look up the nearest service center. The answer is … Read more
The hardware inside a robot vacuum does not care which continent it sits on. The app does. Dreame says so on its own support pages, in plain language, and the admission covers both the connection and the warranty. The exact wording: devices that were not officially imported through authorized local distributors may be unable to … Read more
A Chinese phone with no Google Play looks fine for about a day. Then your bank app says the device isn’t certified. And it won’t open. Google Play is really two things sharing one name. There’s the store. That part is easy to replace. Under it sits a bundle of background services. That layer is … Read more
You can bind a US credit card to Alipay in about ten minutes. Whether Taobao accepts that card at checkout is a different question, and almost nobody writes about it. Every English guide I found on this is written for tourists. They answer one thing: how do I pay for dinner in Shanghai. That’s a … Read more
Wi-Fi 7 sounds like a simple number bump. It is not, because the upgrade that matters lives in the 6GHz band, and phones built for mainland China ship without it. Regulators there handed that spectrum to mobile networks instead of Wi-Fi. The result is a strange split. The same model name, sold in two countries, … Read more
The $800 rule everyone quotes about shipping from China is gone. CBP suspended duty-free de minimis treatment for China on May 2, 2025. Every guide built around that number is answering a question that no longer exists. That isn’t why parcels get stopped, though. Most boxes that never arrive are stopped for what’s inside them, … Read more
Travel eSIMs are the default way to get mobile data abroad now. Most phones bought in mainland China refuse them. The failure shows up at the worst possible moment, when you are scanning a QR code in an airport. Run the ten-second check before you fly. What an eSIM Actually Is An eSIM is a … Read more
Chinese AI apps post user numbers that would embarrass most Silicon Valley launches. Whether you can install one, sign up and pay from the United States is a separate question. It breaks into three doors: the download, the account and the money. Most coverage skips the doors and talks about benchmarks. That is backwards for … Read more