With digital SLRs, and system cameras, they can be easily attach to the hot shoe. But on a camera like GoPro Action? Hardly likely. Unless I use a stick to Selfie and then have both hands full ... If necessary, I could still screw on a tripod, since it is equipped with 1/4 thread. But even that is a Actioncam filmmakers usually do not just have it.
So actually remains the use for normal DSLR or system cameras and various smaller Videocamkorder when they have a hot shoe. As a power source used 4 x AA batteries, or equivalent batteries (not included).
I use it mainly on my NEX-6 when I do for HDR images, frames rows with 3 or 5 images and to need a brightener. Because in this mode does not flash the camera, that gives me the small Walimex LED light just right, because it fits in size to the NEX-6.
The light could also be operated with a separate 5V power supply with standard connection (also missing). Why in times of USB, no USB input is selected, do not open up to me. Since other companies are smarter: eg: Andoer CN-160 LED Video Light (photo light, video light, video light) for Canon Nikon Sony Olympus DV Camcorder Lamp (video) DSLR 780m 5400K can be operated with batteries, as well as a variety of Video Camera Batteries operate and is equipped with 160 LEDs significantly lighter and cheaper to. Only the processing is better again when Walimex.
The only recommendation I can attest to is that it is just quite small, so it can be carried loose in a jacket pocket. For the rest (more light, better power, price, ...) there are better on the market!