Check the listing for details. ELAC ProteK 9 Outet Component Surge Protector/Power Conditioner- Black [PR-81B]. Color: Black, Condition: Used. Listed at 74.59 USD. 3240 Joules of ProtectionThe PR-81B absorbs dangerous spikes to help protect your equipment. The PR-81B can handle a spike current of up to 165,000 Amps and up to 6,000 VoltsStatus LEDsThe 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.EMI/RFI Noise FilteringCertain high power appliances in your home can all introduce noise into your homes electricity. All outlets of the PR-81B filter your AC power providing up to 70dB of noise reduction your sensitive electronics with clean power.Voltage/Current DisplayVoltage/Current Display The front panel of the PR-81B displays the voltage coming from the AC outlet that the PR-81B is connected to as well as the current draw of your connected devices.Quad USB PortsDelivering 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. Simply connect your USB devices to the USB ports on the front or rear of the PR-81B.Over / Under Voltage ProtectionIf the incoming voltage to the PR-81B exceeds 135Vac or drops below 95Vac power to all outlets is turned off until the incoming voltage returns to a normal levelApp ControlSimply 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 the surge protectors outlets.