A:AnswerIf your computer only has micro USB, no, the JDC158 will not work. If your computer has Mini DisplayPort, and the display has HDMI support, then yes, that should work for you.
A:AnswerNo, the JDC159 connects via Mini DisplayPort and will not work with your Samsung Galaxy J7. Alternatively, the JUA165C will work for your intentions.
A:AnswerImac computer can only be used as displays with other Mac computers using some specific setups. I would recommend contacting Apple for more information on this.
A:AnswerYes, it supports up to 4k at 30 Hertz.
** Feel free to contact the Technical Support team mentioned on the packaging for further assistance or if you have any other questions and someone will be glad to assist you.