Fangrui Product Details Electric Key Interface: You Can Directly Connect The Hand Key And The Automatic Key. To Connect The Hand Key, You Need To Connect The Hand Key First And Then Connect The Mobile Phone Or Computer. This Device Intelligently Identify The Hand Key Or Automatic Key. Button: Used To Switch Between Mode One And Mode Two. And Hold This Button To Connect The Computer Or Mobile Phone To Switch Between The Two Modes. In Mode One, This Button Can Move The Mouse Logo. This Function Is Especially Important On Mobile Phones. Pressing And Holding This Button Can Move The Mouse Logo Downward. Move To The Bottom Of The Mobile Phone Screen And Continue To And Hold This Button, And The Mouse Logo Move Upward From The Bottom. Indicator Light: Indicates The Working Status Of The Two States. The Indicator Light Is On In Mode One, Which Is Suitable For Training Software Or App Operated By Mouse, Such As Lakey, Cwplayer, Morsetrainer, Etc.; The Indicator Light Flashes In Mode Two, Which Is Suitable For Some Special Traini