In modern life happen a situation where in the office or at home occurred various problems with electricity, namely the disconnection, changes, horse racing - not so much rare. To break a computer and other office or household appliances may cause unpredictable surges and voltage drop during the shutdown and the inclusion of energy consumers, lightning. Work on the computer at this point could lead to a loss of data or even worse option with the breakage of electronic devices. In order to ensure a safe work on a PC they chose devices such as uninterruptible power supplies (UPS) and voltage. The voltage on the network, change often creates a lot of problems, but to protect your PC from high and low voltage should be applied voltage. It should reliably carry out the filtering of the jumps in voltage and electromagnetic noise. Typically, the front stabilizer bar has a scale input voltage, which can be easily identified with its values that go beyond the minimum and maximum limits. In going beyond their limits stabilizer publishes a special sound. The choice of voltage based on power equipment, to be secure. The main condition for reliable operation - good grounding and proper connection voltage stabilizers. Voltage partially or fully protect the equipment from most of the problems of poor quality electricity. But turn off the electricity they can not defend. Very often, after problems with the power needed to PCs or other equipment were included for some time, the importance to complete the work, save data and full shutdown. Also, terfynu'r stress can lead to a very rapid deterioration of the expensive equipment like the computer. In this case, can help uninterruptible power supply. Available today, UPS provides offline PC for some time and protect against voltage shock not only power but also communications, that is, do not burn fax, modem, telephone.