This device works well once you ""translate"" the odd foreign-English instructions and non-standard markings. The top green lights, adjusted by the ""Duration"" button are not durations, but angles from 15? to 360?. The next-row red lights, adjusted by the ""R.T."" button, are times in 5, 15, 30, and 60 minutes. To change the rotation direction from clockwise to CCW, you push the Duration and R.T. buttons simultaneously, and a light goes on. Once you've figured that out, you're good to go.The unit rotates quietly. I've gotten very smooth and satisfying results on my Sony AX53 videocam using the device, and its settings are flexible enough to make a complete circle in 5 minutes, or a turn as small as 15? in an hour for time-lapse effects. My main complaint is that it is heavy on the top of the tripod, and can wobble unless locked down. I also wish there were a level indicator, and a way to keep it from going off level when you need to point up. It also takes hours to charge with its micro-USB cord, but seems to hold a charge pretty well. It comes in a nice soft zipper case. I recommend starting the rotation before turning on the videocam, and stopping the video before turning it off. Be sure you know which direction it will rotate, because at the slowest speeds, it's hard to tell that it's moving at all.