ElectraHealth was the first to develop grounded USB chargers. Now they have an affordable solution for reducing electric fields - EMF/EMI/EMR - in environments. It is usually used for health purposes, but it can also be used for sensitive electronic environments. Charge phones, tablets, and other devices, or power always-on devices without generating enormous and powerful high-voltage fields from the 120-volt AC power. By grounding the USB charging ports, you are safer from what would normally extend those fields far out into your environment. Gain 2 USB-A charging ports and 1 USB-C charging port and gain extra power outlets for other devices in this ETL certified, affordable adapter.