You can use an Android phone like the Micromax Canvas Knight 2 to act as a remote control for your Roku 4.
First go to Google Play to download and install the Roku App.
Make sure both the Roku 4 and the Micromax Canvas Knight 2 are connected to the same WI-FI network. You should be able to see the Roku 4 on the Roku App. After selecting the Roku 4, the App will connect with your Roku 4.
You can go ahead then to use the App to Search for content to play and directly control the Roku 4 as a remote.
The Micromax Canvas Knight 2 works well as a secondary remote for your Roku 4. Even though the Roku 4 has its own fancy remote, using your Android phone is more convenient if you need your keyboard to search for content and handy as a secondary remote.
You can also use the Roku App to take photos stored on your Micromax Canvas Knight 2 and share them on the TV connected to the Roku 4. In the main Roku App menu, just select Play on Roku, choose which album your photo is stored in, and select the photo you want to share. You'll be able to see the photo displayed on the TV connected to the Roku 4.