POWER PROTECTION - ProteK offers advanced power management, including surge protection, filtration & USB charging. The PR-71S absorbs dangerous spikes to help protect your equipment. It can handle a spike current of up to 144,000 amps & 6,000 volts. SURGE PROTECTION - Power surges can originate both inside and outside the home. The PR-71S offers up to 2160 joules of surge protection and reacts to surges in 1 nanosecond. NOISE FILTRATION - AC power can become noisy on its way to your home and ultimately to your equipment. All outlets of the PR-71S offer noise reduction (up to 58dB), providing your sensitive electronics with clean power. DUAL USB PORTS - Delivering up to 2.4 amps, the PR-71S not only protects your sensitive electronics from AC surges but also offers the convenience of USB charging. Simply connect your USB devices to the USB ports on the front of the PR-71S. LED INDICATORS - The status indicators on the PR- 71S let you know when your connected equipment is protected, if the AC outlet the PR-71S is connected to is properly grounded, the correct polarity, and if unsafe voltage is coming from the wall. PROTEK SERIES - The ProteK series of surge protectors from ELAC provides sophisticated protection for your sensitive electronics.