This USB Y-cable by DeLOCK made for additional power supply of USB devices. Just plug the red connector and the black connector into 2 free USB ports of your system and the device to the USB female jack of the adapter. Thus your device will be supplied by 2 power sources. The red connector indicates the extra power source and will be provided parallel to the black data/power interface.This cable comes in DeLOCK polyethylene bag.