First, I will admit my foolishness: I thought this had a touchscreen for controlling the color. It does not. I looked over the photos carefully before deciding to get this, and had convinced myself that I was getting a touchscreen controlled device. I was wrong. But that's my fault. I mention it only in case you are wondering the same.Having said that...This is an impressive little light. It is very lightweight, adding negligible weight if you connect it to your camera. Note that this is not controlled by your camera. It mounts to a standard flash connector, but is meant to be a steady light source, rather than a strobe flash.The light is plenty bright for some purposes. It can add a nice bit of fill to macro photos, but the brightness drops off quickly within a couple of feet. Don't expect to light a room with this, but it certainly has its uses.The light basically has two modes: standard and color. Standard (non-color) mode allows you to adjust both the intensity and warmth of the light. Color mode allows you to adjust the color and intensity. In color mode, the color is selected by setting a number of degrees from 0 to 360. There is a label on the light (it's the label I mistook for a touchscreen) that shows the mapping of colors to degrees. This uses a standard HSV color model where 0 to 60 degrees is red, 61 to 120 is yellow, and so on. You don't need to know anything about this model in order to change the color: just look at the label and adjust the degrees to match the color you want. Then, adjust the itensity.The interface is simple: 3 buttons. The mode button allows you to switch between standard and color modes using a long press. Once you choose your mode, a short press of the button allows you to switch between adjusting the intensity, or the color/warmth (depending on which mode you are in). The other two are directional buttons for increasing/decreasing the value you want to change (color, warmth, or intensity). You can press to increase/decrease one step at a time, or press and hold to quickly move through the values. It's really quite simple, and can be figured out in the dark. It would be helpful if the buttons were easier to distinguish in the dark (perhaps a bump on one of the buttons would have helped). But it's easy to learn.All in all, this is a handy and versatile little light. Oh, and it doesn't have a touchscreen.