Without computer mouse work on a modern PC is unthinkable. In the 60 years of the twentieth century Douglas Engelbart was invented this device and since then the mouse has become an integral part of every computer.

Computer mouse - one of the most inexpensive devices, so its choice is paid very little attention: if only it worked and was cheap. However, the convenience and speed of working for a PC depends on how convenient and functional the mouse is. How to choose a good computer mouse?

The principle device all of the mouse can be divided into three groups: mechanical, optomechanical, and optical. The first mouse was a mechanical. The position of the cursor in mechanical mice  is determined by the rotation of the rubberized ball, which is fixed between two mutually perpendicular rollers. These rollers are responsible for movement along the X and Y axes. Data from the rollers in the mechanical arms are transferred to the copper contact system.

In opto-mechanical mice  The copper contact system is replaced by a so-called optocoupler: an infrared receiver and photosensors. Mechanical and optical-mechanical mice have a number of significant drawbacks.

Firstly, dirt accumulates in them very quickly, which disrupts the normal operation of the mouse. This leads to the fact that the mouse must be disassembled and cleaned. And secondly, the rubber ball in mechanical and opto-mechanical mice often sinks, slips, which also causes the mouse to become unusable.

Optical computer mouse  almost completely replaced their mechanical counterparts. In optical mice work is carried out due to the light emitter and the receiver of the light signal. The light reflected from the surface on which the mouse is located is read by the receiver and the displacement of the cursor position is calculated.

Due to the lack of mechanical moving parts, optical mice have a significant advantage – they are more durable than mechanical. In addition, work optical can mouse on any surface (except mirrors), it does not need Mat.

Sensitivity  - one of the most important functional parameters of a computer mouse. Measured in points per square inch (dpi). Optical mice have a much higher sensitivity than mechanical ones, and in modern models can reach several thousand dots per inch (1000-4000 dpi). High sensitivity is often the most important for those who work with graphics, because the accuracy of positioning for them is of great importance.

Another important parameter is frequency. with which the mouse sends and processes the light signal. The higher the value of this parameter, the higher the speed of the mouse. This parameter is especially important for gamers.

Computer mouse connect to the computer either through an interface PS/2. either throughUSB. Wireless mice stand out separately. In this case, the mouse itself does not have any wires, but transmits the signal to the "base" connected to the computer via the USB port. The wireless mouse is powered by batteries or batteries, and therefore much heavier than its wired counterparts.

The following parameters such as functionality and ergonomics. purely individual. The functionality of the mouse depends on the availability of extra programmable buttons, scroll wheel (scroll). A standard mouse has two buttons and often one scroll wheel. Mouse with three or more buttons are needed to solve specific problems. For example, for 3D games, works, AutoCAD, etc.

The shape and dimensions of the mouse body, as well as its weight, determine the ergonomics of this or that model. There are standard symmetrical mice of round shape, there are so-called anatomical mice, whose body repeats the bends of the brush. Anatomical mice contribute to a more comfortable position of the hand during work.

The size of the mouse is selected individually, depending on the size of the hand. Therefore, when buying a mouse, be sure to hold it in your hand and check how convenient it is.