use the 3 channels constant decoder, which take advantage of advanced microelectronic control technology. This technology changes the international fashion DMX512/1990 standard digital control signals into analog control signals.There're 1 ~ 3 output channels; each channel can achieve 256 control levels. This constant decoder is used when DMX512 control equipment control general LED lighting. Due to different product batches, the appearance may be different, which does not affect use. Colour:Black Material:plastic+metal Package Contents: 2 x RGBW4CH DMX 512 constant decoder 2 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.