AirDroid contains many features and some of them have requirements on device. For example, "Find Phone" requires GPS, "Camera" needs camera. While downloading AirDroid from Google Play, Play Store will automatically check if your device meets the requirements. If not, Play Store will report that the app is incompatible with your device. However, when you transfer the apk to your device and install it, AirDroid can work well except some features. For example, AirDroid installed on a Google TV, the feature "Find Phone" is invalid due to Google TV's lack of GPS.Why AirMirror feature doesn't support my device?
AirMirror is a beta feature so only some rooted devices (with Android 4.0+) are supported now. Whether your device can use AirMirror or not is depending on the ROM of your device.Known AirMirror Supported ROMs List (ROOT Required)