The Xiaomi Yi Action Camera is extremely affordable but doesn't come with its own LCD display. It's best to use a smartphone like the HTC One (M8) to view what you are taking and control the Yi Action Camera.
To use the Yi Action Camera, first go to Google Play on the HTC phone and download the Yi Action Camera App from Xiaoyi Technology, the official App of the Yi Action Camera. Make sure you have charged the Yi Action Camera before you start using it. Once you open the App, the App takes you through the steps for connecting to the Yi Action Camera.
First press the power button at the front of the Yi Action Camera to turn it on. Next press the WI-FI button on the side of the camera to start the WI-FI network.
On the App, press the red button to connect to the Yi Camera over Wi-FI.
You should be able to immediately see what the camera is seeing through the App. You can switch between camera and video modes and start/stop recording through the App as well. If you select the Settings icon, you can change the camera video formats and resolutions.
To view all the photos and videos stored on the Yi Action Camera, select the file folder icon on the App. The Xiaomi Yi Action Camera works well with the HTC One (M8) - both are very affordable for the budget conscious user.