2. This is not the unit, which can also be used for constant current source type Buck, most of the market does not come with reverse protection and fan input port, and precision light source. Features: 1. High power blue controller circuit, in the previous version of the increase of direct port 5521DC, to solve the market in the stage controller can not be directly connected to the power defects. 4. More convenient, easier to use. 3. And add a precision light source required to protect the 30-second slow device, which greatly improves the convenience of non-professional users, and the use of a more convenient and user-friendly fan input port, the power supply can be used for constant current source type. 5. TTL modulation instruction: external voltage signal 0-5v (0 is off, 5 is on, frequency determines the speed of light flashes ), if only make a bright and long light source, this function can be ignored., Weight: 0.029541943108 Pounds, Manufacturer: Faeymth