The Triplett USB-Bug is designed to test the power, voltage, and current from the USB-A port of Power Sourcing Equipment (PSE) (i.e., where the power is coming from). It does this by connecting the USB-Bug inline between the PSE and the Powered Device (PD) (i.e., the device you are trying to charge). The USBBug can also act as a splitter, allowing two separate devices/PDs to charge from one PSE port.

The USB-Bug has two out-ports; one port allows data to pass through, the other port does not allow data to pass through. Both ports utilize an Intelligent Charging function that allows the PD to charge at the maximum safest current for that device.

Some examples of Power Sourcing Equipment include USB wall jacks, USB ports on a computer or laptop, or a portable charger.

Some examples of Powered Devices that may connect to a USB port to charge and/or communicate include tablets, smartphones, computer mouse, computer headsets, and so forth.