Media Rewards is an app. You don't have to use it actively, just leave it on in the background. This way you can easily earn rewards just by watching TV and listening to the radio. Opt out at any time.
You will earn points by allowing the app to automatically measure exposure to TV, YouTube, and radio ads in your surroundings. You never need to use the app actively, you can press the home button of your phone, and the app will continue to run in the background. Your points will be collected at the end of the month for the prize draws. Additionally, you can be invited for brand surveys to earn gift cards if you have enough points.