Features: --YN300 III is equipped with 8 channel grouping function and battery capacity testing function.  it supports remote controlling with remote controller, wireless controlling with mobile phone ( supports Android 4.3 and Bluetooth 4.0 version and above IOS7.0 and iPhone4S and above mobile phone ) and group controlling the luminous intensity of YN300 III etc. APP can be downloaded from the official website or through the dimensional code scanning on the gift box.  YN300 III is equipped with multi channel wireless remote controller which is used to adjust the luminous intensity and control the switch of YN300 III. Furthermore, it is very convenient to use this controller to control the luminous intensity and the switches of 8 groups of video lights.  --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.  YN300 III adopts 300 high quality LED lamp beads with chips of extra-large luminous area. In the same energy consumption, the luminous intensity is greater, the facular is more uniform and the service life is longer.  YN300 III adopts proprietary LED driving technology which does great help to effectively avoid corrugation and stroboscopic flash.  --YN300 III adopts encoder digital dimming system, including coarse tuning mode and fine tuning mode.  On the LED digital display screen of YN300 III, the parameter of the power output is intuitional.  Shooting for long time is possible because YN300 III supports external DC power input (power adapter is optional).  YN300 III, equipped with 2 pieces of color temperature filters, can be used under different circumstances.  --External Power Supply: It is recommended to use power adapter with YN300 III to obtain lasting service time. When using external power supply, the video light will stop the battery power supply automatically and will not get the battery charged.  The external power supply interface outside is positive and the interface inside is negative. The input voltage is 8V and the electric current is 5A.Note: If YN300 III defective when it is used with power adapter of other brands, YN300 III will no longer be guaranteed for repair.  --Remote Dimming Mode: The wireless remote controller attached can adjust the luminous intensity and control the switches of YN300 III.  The maximum remote controlling distance is upto 15 meters.  Remote Control with Mobile APP: The product supports mobile phone remote controlling (supports Android 4.3 and Bluetooth 4.0 version and above IOS7.0 and iPhone4S and above mobile phone), APP can be downloaded from the official website or through the dimensional code scanning on the gift box.  Compatible With: Almost all the SLR cameras camcorders,like for Canon Nikon Pentax Olympus Samsung for Panasonic JVC and so on.Except Sony&Minolta(It needs hot shoe adaptor to use the LED light).