You do know Chromecast allows you to 'screen mirror' without a wifi connection?
Works great for downloaded Amazon Prime content.
I didn't want to type it out... so this is from the from the 'net...
For devices running Android 5.0 or higher:
Swipe down from the top of the screen to see the notification shade, then swipe down again to view quick settings.
Tap the Cast button at the bottom of this menu, then choose the Chromecast to which you want to mirror the display.
Exit this menu and head to whatever app or website you’d like to mirror.
To stop Casting, return to the quick settings menu, press the Cast button, then press the 'x' icon next to your Chromecast.
On all Android devices running Android 4.4.2 or higher:
Install the official Chromecast app from the Google Play Store if you don’t have it already.
Open the app, then click the menu button (a stack of three horizontal lines) in the top-left corner.
Select Cast screen/audio from this menu, then press the yellow Cast screen/audio button and select your Chromecast.
Exit this app and head to whatever app or webpage you’d like to mirror.
To stop mirroring, return to the Chromecast app, open the Cast screen/audio menu and press Tap to Disconnect.
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