GVM Multi-function Remote Control for Photography Light is specifically made for professional photographers, by matching the channel value of the remote control and the device, you can have full control of the GVM series of photography lights. First, there are 3 light effect modes: CCT mode, HSI mode, and FX light effect mode. For CCT mode, color temperature and brightness can be selected and adjusted, and directly select the corresponding color temperature. For HSI mode, the brightness, hue and color purity can be selected and adjusted, and directly select different corresponding color on the remote control. For FX light effect mode, you can adjust the type of light effect mode, but connecting different types of photography lights need to correspond to the mode they have. In this mode, you can select the brightness and speed mode, and adjust the brightness and speed according to your needs. Besides, the wireless frequency of this unit is 433MHZ, and it can work in the environment of -10 degrees to 40 degrees. Then, please note that this unit is battery powered and requires two 3.0V batteries (AAA*2, need to be purchased separately). Finally, this unit is compatible with most of GVM's fixtures, such as the PRO series of photography lights, some of the SD series of lights, and 800/1000/1200D lights and so on. And please refer to the manual for specific models.