The DC coupler is decoded, what you should do is just confirm the button when you switch on your camera.
Primarily built for convenience in studio, allow you power your DSLR camera by power supply station or high capacity Li-ion battery instead of DMW-BLB13/GK battery, DC couplers also can increase the efficiency when shooting.
Compatible with Panasonic cameras:
Lumix DMC-GF1
Lumix DMC-GH1
Lumix DMC-G2
Lumix DMC-G1
Lumix DMC-G10
