POWER PROTECTION - ProteK offers advanced power management, including surge protection, filtration, USB charging & control. The PR-81B absorbs dangerous spikes to protect equipment. It can handle a spike current of up to 165,000 amps & 6,000 volts. SURGE PROTECTION - Power surges can originate both inside and outside the home. The PR-81B offers up to 3240 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-81B offer noise reduction (up to 70dB), providing your sensitive electronics with clean power. QUAD USB PORTS - Delivering up to 2.4 amps for each pair of USB ports, the PR-81B not only protects your sensitive electronics from AC surges but also offers the convenience of USB charging. LED INDICATORS - The status indicators on the PR-81B let you know when your connected equipment is protected, if the AC outlet the PR-81B is connected to is properly grounded, the correct polarity, and if unsafe voltage is coming from the wall. ELAC PROTEK APP - Download our free ELAC Protek app and connect the PR- 81B to your phone or tablet via Bluetooth LE. The Protek app allows for setting a countdown timer, scheduling, and controlling the power on groups of outlets on the surge protector. PROTEK SERIES - The ProteK series of surge protectors from ELAC provides sophisticated protection for your sensitive electronics.