Sooner or later, the motorist is faced with the necessity of buying a DVR, but select the desired model is not so easy. The market offers dozens of different brands offering DVRs with the various features and options. Understand all this variety from scratch is very difficult, so in this article we consider the basic parameters that are worth paying attention to when choosing a DVR. The quality of night shooting housing construction The presence of additional functions Video Recording Format Memory cards Manufacturer results The picture quality The picture quality when choosing a DVR is the most important parameter that depends on the following parameters: Resolution. If you are interested in DVR with good quality recording, the camera with a resolution of at least 1920 to 1080 (the so-called Full HD) should not be considered. The picture recorded on a low-resolution camera may be blurred, so the dynamics are some details become indistinguishable. Save on this is clearly not worth it. In addition, the market offers a lot of low-end models, capable of filming in high definition. It is worth noting that the resolution of Full HD to be honest. This means that the device must support matrix of said scan, and not artificially create the resolution of fewer pixels. It is also worth considering that the larger the matrix – the better the recording quality. Optics. To achieve maximum recording quality DVR best suited glass lens, but the market there are many models with good plastic “glasses”. However, the recent weakness is a vulnerability to mechanical damage of plastic that will eventually lead to a loss of optical properties. When you select the DVR should pay attention to the lens aperture ratio and the lack of a serious distortion in the edges of the frame. Another important parameter is the angle of view of the lens, which can be specified by width, height, or diagonally. Lenses with a viewing angle of less than 100 degrees in width provides very little information in the frame, and too broad (more than 130 degrees in width) reduce the sharpness of the image and distorting the image. CPU power and quality of the matrix. It is necessary to not only DVR records video in high definition, but also gave a high frame rate. The optimal value is considered to be the frequency of 30 frames per second. In this case, the record is obtained not only clear, but also smooth. Scan processor speed and quality of the matrix necessary in the middle and low illuminance, the frame to be exposed as much as possible to different objects. The resulting record is necessary to study the presence of different noises, colored grains and other artifacts. If any are detected, you should seriously consider buying another model. The recording quality DVR in the dark depends on the factors described above, but some models are capable of delivering clear and smooth image in the afternoon, with the recording made at night are much worse. Best quality night images from the DVR provides a bunch of good sensitivity matrix with high-aperture optics. However, in the majority of low-end models use the program night mode, allowing to increase the sensitivity of the matrix, as well as normal or infrared LED Backlight. These options can slightly improve the night picture, but no more. It is also important how fast the device is able to adapt to different light levels (for example, when leaving a dark highway on a bright lit street). Many DVRs to cope with such a task is not easy, which is why the quality of the image obtained at a sharp change in illumination is poor. To learn how the device responds to illumination variations, exit the store with included registrar in the bright sunlight, and then look for a videotape. When choosing a DVR also pay attention to the design of its body. The most common so-called close-coupled device. Such recorders are a digital camera, while its reverse side is the screen size and resolution of which are of no particular significance. The latter may be absent as in the cheap, and in the most expensive models, where the display can perform the role of a smartphone connected via Wi-Fi wireless interface. There are also a model compound with the crankshaft, and also with a rotary camera module. The articulated connection of two parts of the housing or body of the camera module allows to place the device in such a way that not only the lens unit has been directed in the right direction, but also provided the best view. DVRs with such a structure housing more versatile, but also more expensive. In addition, during frequent turns in such devices there is a possibility of chafing trail camera connection. The market is also found DVRs shaped mirrors. The main advantage of this design is minimalist, invisibility and no need for a constant installation / disassembly. However, these registers are not particularly popular, and are much more expensive, so the market there are only a few such models. type of mounting Most motorists to install and remove the DVR at least twice a day, so this operation should be as simple and comfortable as possible. In the market the most common device on the suction cup holder. Such video recorders are connected to the suction cup through the hinge bracket, or flexible rod, although there are also models with “fixed leg” where the camera angle is determined by its angle or rotation of the body portion on which it is located. Deciding to buy a DVR on the suction cup, you should pay attention to the degree of freedom pivoting bracket element, as some models it is virtually absent. Also note method daily mounting / dismounting device. Some registrars are attached with suction cup, and the other – on the constantly hanging on the suction cup mount. The first is easy enough to fix / shoot, but the glass are characteristic marks of the suction cup. The latter not have this drawback, but in some models the latch is very tight, making it difficult daily installation. In addition, there is another variant of fastening DVR – clip on double-sided tape. She once mounted on the glass, then the recorder is inserted into it at every installation. Write protection. When the DVR memory ends, it starts overwriting the oldest video. The “write-protection” allows you to make last saved movie “untouchable”, thereby protecting it from being overwritten. The second chamber. If the main camera shoots what is happening on the road, the second lens is sent directly to the salon. The advantages of such “devices” very controversial, but the flaws – completely. DVR with two cameras are much more expensive than usual, since it need more powerful processors and capacious memory card. Sensor GPS / GLONASS. DVRs with this feature are equipped with a satellite receiver and can be added to the image information on geolocation and speed of the vehicle. In addition, some models of DVRs satellite module is also used for the detection of fixed speed devices to warn the driver of their presence on the route with a sound or graphic signal. Built-in radar detector. A useful option, but in most cases the use of individual devices is much more convenient and easier. Motion Sensor. Activates recording only when the frame is any movement is detected. The usefulness of such a function is a big question. Picture Mode. Also quite useless mode. Why do with the DVR picture of a moment when you can simply cut the desired frame from the photographed video, or use a camera phone? Remote control. In fact, just a toy. Video Recording Format When choosing a DVR also pay attention to the recording format in which the videos are stored. The most common formats are AVI, MP4, MOV. They provide enough high quality pictures and at the same time convenient to work with them, because to play back movies recorded in these formats can be virtually any computer or tablet, install third-party codecs without the need. If the DVR records video in less common format, then you will have to find the necessary software. Memory cards Some DVRs have a certain amount of internal memory, but it is not always enough. As for external memory cards, the most universal formats are SD and microSD. The latter differ from the SD-card smaller size, but with the appropriate adapter information from them can be read via the SD-card slot. Manufacturer Until a few years ago, the market has been flooded with various Asian DVRs that are virtually indistinguishable from each other. Now the situation has changed for the better, and the stores were also models of famous brands, which are available under the really high quality device. Most noteworthy DVRs those producers who are own representative or importer of customer service, as in this case, the buyer can expect a warranty repair of the failed device. In addition, some companies continually improve the software trim video recorders, eliminating the existing bugs and adding new features, so the purchase of such a device is more than justified. With a limited budget should focus on choosing a camera with very good quality, but the other options and parameters to sideline. In addition, you must pay attention to the ergonomics of the device. Since you’ll have to interact daily with DVR, its controls should be intuitive and easy to use. Note that the vast majority of modern recorders are able to impose on the record the date and time, record sound, support removable memory cards, and overwrite the oldest videos when new memory is low.