Canon LP-E6 dummy battery with pole DC cable
S-7500E is the Canon DSLR battery LP-E6 type dummy battery adaptor.
Insert the dummy battery head into Canon DSLR 5D2/3/4, 6D/2, 7D/2, and connect with pole-tap DC power source, you can prolong the camera running time or get uninterrupted power source from AC-DC adaptor.