Thank you for choosing YONGNUO YN900 LED video light! YN900 is formed by 900 lamp beads with extra-large luminous area. In the same energy consumption the luminous intensity of the lamp beads of YN900 is higher. YN900 adopts proprietary LED driving technology which does great help to effectively avoid corrugation and stroboscopic flash. It also adopts encoder digital dimming system which helps to make accurate and reliable dimming. YN900 is equipped with 8 channel grouping function and battery capacity testing function. And it also supports remote controlling with remote controller wireless controlling with mobile phone and group controlling the luminous intensity of YN900 etc. The multifunctional Type-D lamp holder configured is suitable for multiple different fastening methods. Function Introduction: 1 YN900 is equipped with multi channel wireless remote controller which is used to adjust the luminous intensity and control the switch of YN900. Furthermore it is very convenient to use this controller to control the luminous intensity and the switches of 8 groups of video lights. 2 A mobile APP is provided on our official website. With this mobile APP you can control this LED video light with your mobile phone read the current parameter of the luminous intensity and channel and control the luminous intensity and the switches of 8 groups of video lights individually. You can control your LED video light as needed. 3 YN900 is equipped with a Type-D lamp holder which is very convenient for you to fasten and use YN900 on various kinds of flash bracket. 4 YN900 adopts 900 high quality LED lamp beads with chips of extra-large luminous area. In the same energy consumption the luminous intensity is greater the faculty is more uniform and the service life is longer. 5 YN900 adopts YONGNUO proprietary LED driving technology which does great help to effectively avoid corrugation and stroboscopic flash. 6 YN900 adopts encoder digital dimming system including coarse tuning mode and fine tuning mode. 7 On the LED digital display screen of YN900 the parameter of the power output is intuition. 8 Shooting for long time is possible because YN900 supports external DC power input (power adapter is optional). 9 The fan forced heat dissipation YN900 adopts solves the heating problem after the long use of LED video light. 10 YN900 equipped with 2 pieces of color temperature filters can be used under different circumstances. Remote Control with Mobile APP The product supports mobile phone remote controlling (supports Android4.3 and bluetooth 4.0 version / IOS7.0 and IPHONE 4S and above mobile phone) APP can be downloaded from the YONGNUO official website or through the dimensional code scanning on the gift box.