Professional LED Video Light Panel with Barn Doors 40W 4500LM Dimmable Continuous Output Lighting 48CH 6 Groups 2.4GHz for Studio Photography YouTube Video Shooting High Brightness LED Video Light: 40w output power + 4500lm+8mm high performance LED Beads 2 Ways to Adjust Brightness: rotate to adjust accurate brightness from 1-100% by 1%. Or, press the quick brightness adjust button to recycle to change brightness between 1%, 25%, 50%, 75% and 100%. 4pcs Foldable Barn Doors: to shape or control the beam of a light by keeping it off the places you don't want it. Master and Slave Function: This LED video light has 48CH and 6 groups. In same channel and same group, you can choose any one of lights as a master. If you change the setting of this light, the others will be changed synchronously. This function only work between lights in same channel and same group. Two Options for Power Supply: 14-18V 5A DC adapter powered makes your indoor shooting last longer. Battery powered makes outdoor shooting becomes easy. 2pcs Sony NP-F Series Li-ion battery required. Note: Battery NOT INCLUDED.