In recent years, three outdoor mobile phones, an alternative mobile phone originally only popular among outdoor sports enthusiasts, are gradually becoming more and more familiar to consumers. A variety of manufacturers have also seen business opportunities among them, and have made every effort to develop many new products that are dazzling and are known as three-phones. Many consumers are at a loss for the time being, unable to choose a true outdoor sports three-defense mobile phone suitable for themselves in a variety of products that are indistinct and indistinct. The author here combined many years of outdoor three anti-mobile phone purchase experience, and contact the so-called new three anti-mobile phone propaganda in the recent market, clear some features and concepts of outdoor three anti-mobile phone, hope to give some help to users intending to buy outdoor three anti-mobile phone . Talking about the three anti-mobile phones, the concept of immediate emergence in the hearts of many users is probably that there are three protective features mobile phones. waterproof? dust-proof? And shockproof? Or drop? It's really unsure how long it will take. So there are some manufacturers take the opportunity to launch the so-called four defenses, five defenses, and even six, seven, eight defense of the so-called strongest protection mobile phone. This propaganda is very ridiculous, typical of cottage-style marketing. In the author's opinion, these marketers do not dare to compliment the Chinese level, and elementary school teachers should spank. Is the three-defense phone really a mobile phone with only three protection features? the answer is negative! People who know a little bit about ancient Chinese should all know that the word "three" is actually an estimate and does not necessarily mean that there are only three certain numbers. Many idioms use the “three†to make estimates. For example, three points in the wood, three picks and four picks, and three feet in the ice are not cold for a day...and so on. Therefore, the three anti-mobile phones do not mean that there are three mobile phones with protective functions. The more accurate argument I think can be understood this way, the three-defense mobile phone refers to a mobile phone with multiple protection functions. These protective functions may be four, five, six or even more. Only three anti-mobile phones, no four anti-virus, five anti-mobile phones. The three anti-mobile phones also do more than just have three protective functions. About the waterproof function of outdoor three mobile phones. Many users think that the longer the waterproof time, the better, because it can only be called three defenses. actually not. We know that an important function of a cell phone is a call, so the cell phone will have a handset, a receiver, and loud speakers. These three devices are all transmitted through the network by transmitting sound through air vibration and then converting them into electrical signals. The waterproof function of the three-proof mobile phone is to place a waterproof material in places where these devices are in contact with the outside world. These waterproof materials will play a tight protective role after being exposed to water, making it impossible to enter, and even the air cannot enter. At this time, it is impossible to make a call at all. Even if it is taken out of the water, it must be dried before all sounds can be restored. Therefore, waterproofing of mobile phones has a certain depth and time limit, and it is impossible to achieve unlimited depth of waterproof for a long time. Waterproof watches are not the same, because there is no sound device, the watch can be completely sealed, there is no problem with 10 meters. The three-proof mobile phone's waterproof standard can now reach IP67, which is 7-level waterproof, can be placed in 1 meter deep water for up to 30 minutes. A higher level of waterproofing is not even guaranteed by the manufacturers. Those mobile phones that advertise better waterproofing than the IP67 are impractical. As for the outdoor anti-drop or anti-pressure capabilities of the three mobile phones, it is not unlimited. Because there is a very important component inside the mobile phone - battery. Today's cell phone batteries are usually lithium batteries. Lithium batteries are very electrochemically active batteries. Therefore, qualified lithium batteries need a protective circuit board to prevent their excessively active chemical reactions from swelling and even exploding. Lithium-ion batteries are not able to withstand strong impacts and crushing. Any excessive external force will most likely cause the battery's activity to change instantaneously. This can easily cause safety problems and require special attention. The three outdoor anti-mobile phones are no exception. Although the three anti-cell phones have already done a lot of battery protection, they still have certain limits. Usually the external force plane rolling can not be heavy rain 1500 kilograms, and it must be plane rolling, dropping no more than 2 meters. Exaggerated promotion by some manufacturers is extremely irresponsible to consumers. The three-defense mobile phone test standard can refer to the OEPT (outdoor Environment Performance Test outdoor environment full-defense test). This standard has a clear definition for the outdoor three-guard mobile phone protection function and is worth learning from. All-metal Rechargeable Hair Clipper all-metal Rechargeable Hair Clipper Yuyao Shenghe Electrical Appliance Co., LTD , https://www.yyshenghe.com