No matter wage earners or middle class, who doesn't know that spending money is easier than making money? Who doesn't want to do more with less money? It is naturally gratifying to buy cheap and good things. The mushrooming second-hand market and flea market make it possible to discount everything from airplanes and cars to tables and chairs, shoes and socks. The temptation of discount is certainly exciting, but you need to be reminded that some money is better than nothing; Some things are lacking rather than excessive. Please think twice before you buy the following second-hand goods. Second-hand notebook computers for home appliances: Most of the second-hand notebooks are worn, but the light ones are small scratches and keyboard surface wear; The serious performance is that the shell is broken and the color fades in a large area. Battery is the largest consumable of notebook computer and has the shortest life. If you use it frequently, it will cause problems in about 1 year and a half. The battery standby time of most second-hand laptops is very short, generally less than 1 hour. Low LCD brightness is also a common problem of second-hand notebooks, which is generally unavoidable. In addition, the warranty time may be the biggest problem of second-hand notebooks. Most second-hand merchants only provide 1 month free machine maintenance. After this period, you can only bear the maintenance costs yourself. If you really want to buy a second-hand laptop. Then remind you, never go to an informal place to buy a second-hand laptop with informal channels. Friends who often go to Zhongguancun in Beijing and Tianhe City in Guangzhou know that there are often some vendors selling second-hand goods on the roadside or on the overpass. They usually gather around passers-by and sell you some cheap second-hand goods. Some people who are greedy for cheap sell when their hearts soften, but when they get home, they will find that these bought things are basically fakes and inferior products. Moreover, most of these items come in through illegal channels, and there is no quality guarantee at all. When consumers buy this kind of thing, it is equivalent to taking money and throwing it away. Second-hand color TV: In second-hand color TV, it is common that the machine has color cast, such as red, blue or green. Many of these cases are caused by internal failures of picture tubes, and the service life of this TV set will not be very long, so it is best not to buy it. After individual businesses recycle second-hand color TV sets, if they find that the receiving quality is good, they often clean, polish, wax and spray paint the shell. Then, these "brand-new" color TV sets are labeled as "inventory backlog treatment" and "sample treatment", and they are asking for exorbitant prices. Because second-hand color TV sets with automatic search generally have automatic storage failure, in order to cover up the failure, merchants usually take the method of playing signals with VCD and video recorder or adjusting one or two in advance. If you don't test it on the spot, you will have to pay for it yourself when you find the problem. In addition, whether the remote control performance of the remote controller is complete is also a problem. Some machines are equipped with remote controls that are substitutes and may not be fully functional. The TV screens of some second-hand TVs will be large or small, mostly because of the use of inferior components for maintenance, especially the use of inferior transformers. This kind of second-hand TV is troublesome to use, and it usually needs to be repaired again soon. So try not to buy a second-hand TV whose screen size changes with brightness. DVD player: The laser head of DVD player is easily damaged. The laser head itself has a certain service life. Once it is damaged, the maintenance cost will even exceed the original price. Therefore, if you buy an outdated DVD player and save tens of dollars, you may eventually lose money. Vacuum cleaner: This is also a troublesome thing to maintain, and the maintenance cost may exceed the product price. Consumer Report shows that a new vacuum cleaner with good quality now costs only a few hundred yuan. Unless you are a skillful craftsman and don't mind learning to repair the vacuum cleaner yourself, I suggest you buy a new vacuum cleaner. Portable camera: If one day, counterfeiters can make portable cameras out of rubber, then if you drop the camera, it will bounce back and remain intact, so you should buy a second-hand camera. However, if you buy a second-hand video camera now, you will usually get into trouble. You will find that the marks of machine falls will be obvious, and the trauma can be ignored, but those high-tech instruments with internal injuries will be difficult to deal with. If your camera has internal injuries, you will spend a lot of money to repair it soon. Because the motor of the camcorder wears easily, it won't be long before you may spend hundreds of dollars to maintain it. Everyday shoes: Inappropriate shoes will bring many problems. A pair of shoes that don't fit can cause bursitis and even backache. Therefore, don't buy shoes worn by others in order to save a few dollars, so as not to cause pain and unhappiness in the future. Unless you buy a pair of cowboy boots and turn them into cowhide lamps. Mattress: Think about what you did to the mattress you bought. Think about what it's like to sleep on someone else's used mattress When buying a second-hand mattress, you may come into contact with other people's body fragments and bacteria growing on the old bed. Some cunning retailers often put a new quilt cover on the second-hand mattress to cover it up. Of course, some used mattresses can be considered. When the "used" mattress is actually a mattress that has hardly been used, such as a mattress taken out of a guest's room that is rarely visited, then you can consider buying it. Skinny wetsuit: With the passage of time, the sponge-like covering on the second-hand wetsuit may lose its warm-keeping function. If you are a junior diver and wear a second-hand diving suit with weakened protection, the constant change of water pressure may cause harm to your body. In the long run, a brand-new qualified diving suit will save you hundreds of thousands of dollars. Car seat: Car seat injury is a very common phenomenon in traffic accidents. It is not recommended to buy second-hand seats. It is difficult for us to know the past use background of these seats. If some parts of these seats (including instruction manual) have been lost, damaged or recalled, it will be very dangerous to use these seats. Plastic aging, cracks caused by long-term compression, and even collisions that have occurred may bring hidden dangers to second-hand seats, resulting in their failure to play their due protective role in traffic accidents. In addition, if you want to buy a second-hand child seat, you should carefully check the seat that has been used for more than 5 years to ensure safety before using it. You should not buy a car seat that has exceeded its maximum service life. You can buy second-hand car seats from people you trust, provided that you are willing to ensure the safety of your loved ones. Please pay attention to the relevant requirements of the transportation department and don't buy illegal seat models. Helmets: Like car seats, helmets are also used to prevent accidents. A study on motorcyclists and motorcyclists wearing helmets found that people who don't wear helmets are three times more likely to suffer head injuries than those who wear helmets. After the collision accident, the strength of the materials used in the second-hand helmet was destroyed, which weakened its due protective function. Even if it has a good appearance, its safety performance is much lower. Since it is impossible to infer whether the internal structure of the helmet has been destroyed, it is necessary to choose a new helmet wisely.