Simple to attach to my phone & T.V. 1st one didn't work😥 but contacted seller & they replaced. No real instructions (probably on line but I didn't take time to look). Hit Spectrum app on phone & put T.V. to HDMI & kept "fiddling" with settings & suddenly Cable program from phone appeared on T.V. WOW -full screen & clear & perfect! Proud of myself & thrilled with my success. Nothing else needed but this boxed item & an HDMI cable compatible with your phone type. I have a Galaxy Samsung S9 & it is perfect!As you can see, I am certainly not a "techie" & if I can get this to work without instructions, then anyone can!!!😁🤗