5 tech gadgets that you thought were delicious, nutritious and cheap but turned out to be rotten

In a time when everyone is looking for smart, convenient products at good prices, many people think they have "bought a bargain" when they bring home items that are advertised loudly online: such as an oil-free fryer that helps you eat clean and live healthy, a mini personal air conditioner, a bladeless fan that is safe for children, or activated charcoal toothpaste for miraculously white teeth. But when it comes to actual use, many people are "disillusioned": money is lost, and the results are nowhere to be seen.

In recent years, air fryers have become an indispensable item in many family kitchens. Machines priced under 1 million are widely advertised as being able to fry without oil, reduce fat by up to 80%, and even have timer functions and multi-purpose frying such as baking cakes and roasting chicken. However, those who have used them will understand that cheap prices often mean an "unstable" experience.

The most common problem is uneven heat distribution, causing the food to cook on the outside but be raw on the inside. The non-stick coating peels off easily after just a few uses, and the small frying tray limits cooking space. Some people even have to "flip" the food halfway through to keep it from burning underneath. It's easy to understand why many people are upset and share: "I bought it because I thought it would be healthier, but it took longer than frying in a pan."

The product is called by many shops with catchy names such as "personal air conditioner", "portable mini air conditioner", "desktop air cooler" - in fact, it is a small mist fan, battery operated or plugged into a USB port. The advertisement always emphasizes: "cool as air conditioner", "cools in 5 seconds", "suitable for bedroom, study".

But in reality, there is almost no coolness at all. The machine only blows a light breeze cooled through a humid membrane – which may feel comfortable within half a meter, but is absolutely not enough to cool the entire space. Some models even humidify the air to the point that… the desk, laptop or books nearby become humid. One user shared on the forum: "Sitting 80cm away, I can't feel anything. Only mosquitoes seem cool."

The bladeless fan is a prominent invention from Dyson, and was quickly copied by a series of brands, sometimes for only a few hundred thousand. Many models come with extremely attractive advertisements: "safe for children", "even wind, no noise", "minimalist design like Apple products". But many people after buying have had to exclaim: "It's a waste of money not to buy it, it's better to use a regular fan."

Most bladeless fans have such weak wind that you have to sit close to them to feel cool, and when turned up, the motor makes an annoying high-frequency sound, not to mention many cheap ones have a thin plastic body that quickly discolors and cracks easily. Most importantly, there is no wind-generating technology as advertised, it is just a fan with blades hidden in the base, blowing air up the tube ring.

The charcoal toothpaste line once "caused a fever" because of the promise of "naturally white teeth in just a few days", "natural ingredients, does not harm tooth enamel". The price is only a few tens of thousands, the packaging is luxurious, easily making buyers fall in love. But in reality, many dentists have warned that activated charcoal can wear down tooth enamel if used incorrectly or too often.

Many users complain about a tingling sensation when brushing, or only a temporary whiteness after a while because the plaque is temporarily scraped off. Many products do not have clear quality control, and the ingredients are listed as "natural charcoal powder" but the ratio is unclear.

Mosquito lamps are extremely popular products on e-commerce platforms with prices ranging from 50-200 thousand VND. Mini mosquito lamps are advertised to use UV light to attract mosquitoes, suck them in with a fan, and then kill 99% of them. However, most users confirm that mosquitoes still fill the room, while inside the lamp there are only... a few small insects and a few fruit flies.

In fact, this type of lamp is only effective in closed spaces, without other lights, and needs to be placed in the direction of the mosquitoes flying, which rarely happens in normal living conditions. One user shared frankly: "Leave it on all night, turn on the light in the morning and see only 1 fly. Mosquitoes still bite the whole house."

With the cheap price and massive advertising on online platforms, products that seem to contain a lot of technology make users extremely disappointed. Many people, after spending a lot of money, look back and see that their house is full of electronic trash because of useless things. Consider carefully, consult with those who have bought the product and only buy the product when really necessary and buy at reputable stores and brands.

Source: https://khoahocdoisong.vn/5-mon-do-cong-nghe-tuong-ngon-bo-re-ai-ngo-la-do-oi-post1543231.html