Drivers need to pay special attention to the navigation, electronic dog or tachograph machine, the function inside is not the more the better, because many users prefer electronic dog\/tachograph machine. In fact, the more functions of the integrated machine, the greater the heat of the machine will be, so the performance of the electronic dog will decline, and the stability of the tachograph will be reduced. If you have everything, you end up with nothing good. Professional things should be done by professional manufacturers. In addition, the electronic dog\/navigator will also appear electromagnetic interference with each other, so the electronic dog, navigator and recorder are best separated! Generally, a single-core chip is basically a single-core chip. If it is difficult to drive four functions at the same time, it will lead to a delay in the operation of the all-in-one machine, card screen and so on. The current all-in-one machine effect is not very good, buy all-in-one machine are not knowledgeable people, if you want to choose a good electronic dog, then the import is the most good, such as cobra electronic dog and other well-known brands. The driving recorder is mainly to see high clarity, should not pursue more functions, can play the driving record is almost the same.