Buy Cheap Second-Hand Goods
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Pay around 30 CNY to buy second-hand radios, mobile phones, smart watches, routers, etc.
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Dismantle things to learn how they work.
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Knowledge is precious.
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When I did so, after getting some products like a wireless speaker or a Xiaomi Wi-Fi device, which were released almost 10 years ago, they still worked well. This disappoints me because I want them to stop working so I can dismantle them without feeling like I’m wasting things.