Hitec RCD 44168 USB Adapter for X1, X4 and X4+AC
This is an optional Hi-tech USB Adapter Cable and is intended for use with the Hi-tech X4, X4+ and X1 chargers. This adapter is used with your PC computer to analyze the characteristics of the battery, allowing you to see the voltage, current and capacity curves, as well as see the individual voltage of each cell in a Lithium battery pack.