The EGO Power+ ADB1000 adaptor is for use with the EGO BHX1000 Professional-X Backpack Harness and the EGO BAX1500 Professional-X Backpack Battery.
The adaptor fits into the battery slot, under the handle on your EGO garden tool and transfers the power from the battery into the machine.
Adaptor for use with the BHX1000, BAX1500