What's the difference between the Edge and Gamer V2 headsets
The two headsets offer different electrode placements. The Gamer has both electrodes on the forehead while the Edge has one on the side of the head and one on the arm. Other than that, they are the same. They both plug into the Foc.us V2 Controller via a 2.5mm jack. The controller provides the current. The Gamer and Edge headsets cannot be used without the controller.
There is more information available on the foc.us V2 Developer Edition product page. Scroll down to the bottom of the page to read.