These are essential for protecting computers, stereos and other sensitive electronics to ensure their longevity. AVR stands for Automatic Voltage Regulator. That means it takes the volts and amps from the input, converts them and stabilizes them for 'balanced' use by your electronic devices. I am not a salesman but an electronics professional who understands the importance of protecting electronics and ensuring their longevity. And if you're looking for something similar to the battery backup model, make sure the battery backup model you buy is an AVR too! Same price, usually much better.
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