Does anyone know if there are any extension cords with USB that protect from RMI/EMI? When I use wireless headphones or other electronics that produce sound or light some of them will have static noise or leds will flicker slightly. I know this is because of my extension cord. Although, my headphone do this reguardless of the power source EXCEPT for portable powerbanks. Meaning my house power source must have interference! Any ideas on how to fix this?