Not good. I ordered a brand new Fusion NVR system with 4 wired cameras and two wireless cameras, which need to be added using this app. My Android version is 8.1 but nowhere under this app does it say anything about a specific version being required for installation. Lorex tech support found it fit to tell me that I needed to upgrade my phone to a newer phone in order to get the app to work, since it crashes everytime I try to add a wireless camera. Not good, and Lorex support hasn't helped.