It protects electronics form line fluctuations that can short the life of electronics. It filters out electrical line noise, which acts like a hacksaw on some electronics.

An old crt bit the dust last week, and i had no hesitation buying another one to use there. Hp wood lathe, due to the area's crummy power supply regularity. I really like the quality of tripplite lc1200 it sets an american standard for high quality li...  Read More

If it lasts a long time, cost is no issue. I realize the apc is over $150 more in price but in my opinion you get your money’s worth for that investment. I am sure my computers' longevity are benefitting from its use.

The output voltages are shown below as a function of input voltages for the rated input range of the device. Whether amazon shows i bought this or not ('verifed buyer'), i am a verified buyer on this site of two of these and i am disappointed.

When the switch is turned on or off, it makes a rapid clicking and/or electrical sound. It hums even when none of the connected equipment is powered on. The hum is loud enough to be very annoying. It has obnoxious coil whine.