Dimming is variable, and while you can make adjustments locally on the unit, the YN9000 has a built-in eight-group receiver that can accept signals that control the light's functions wirelessly with the included remote at distances up to 49'. There's also a free, downloadable App that lets you control the fixture with a smartphone. The light can run on AC power via an optional adapter or on separately-purchased NP-F batteries. *Integrated Metal Structure Adopts aluminum alloy lamp body frame,greatly improving heat dissipation effect. * Equipped with professional soft box, creating studio supplementary lighting effect. * Wide Angle lighting Adopts ultra-large lamp panel with diagonal diameter of 390mm,using 900 pcs LED lamp beads with high CRI,high brightness,high accuracy and high reliability,creating more powerful supplementary lighting. *360-degree Adjustable Lighting Angle Equipped with professional U-shaped bracket,adjustable at 360 degrees,which makes it easy and efficient to adjust lighting angle,helps you seize every key fill-in light angle. * Lamp Beads with High CRI Adopts 900 pcs LED lamp beads with high brightness,high CRI, long service life,the average Ra is greater than or equal to 95, YN9000 can perfectly restore the true color of the object. *Remote control Supports mobile phone APP to remotely control the LED light,which can control the switches and brightness of 8 groups lights respectively,helping you control the LED light as you want to meet photography needs easily.Equipped with multi-channel wireless remote control , supports channel dividing control for 8-group LED lights,which is more convenient for adjustment (Note:Standard equipped with remote control and LED wireless receiver ) *Professional Constant Current Technology *Adopts YONGNUO proprietary LED constant current driving technology,light output is stable , which does great help to effectively avoid corrugation,photographic effect is more reliable. *Two Power Supply Modes 1.Applicable battery:NP-F series lithium battery. 2.Supports external DC power supply for long time use,the applicable voltage is: 19V 5A (This model is not equipped with external power source, needs to be purchased separately ). * Adopts dual LED digital display, the display effect is more steroscopic and the power output is more intuitional. Specification Color Temperature:3200K-5600K Luminance Angle:55 Color Rendering Index: greater than or equal to 95 Mobile Phone Remote Distance: 15 meters Input Power:65W Remote Distance: 15 meters Lumen Value6975LM Weight:approx.2700g Average lifetime: 50000H Dimension: 410*75*410mm