The PowerShield VoltGuard AVR Power Conditioner keeps your sensitive electronics safe from brownouts and overvoltages by automatically maintaining a steady voltage level. This low-cost compact device provides a constantly regulated output voltage. Thus ensuring that your sensitive electronic equipment receives voltage within an acceptable range at all times. Furthermore, VoltGuard also includes standard, overvoltage, and under-voltage protection. This will cut power to your equipment if the utility voltage moves out of a safe range. It also provides surge protection to protect against transients.