You need a working broadband internet connection

A wireless internet router

You will need to know your personal wireless network security key – known as a WEP or WPA key.

If they are downloading the Pure Connect app for the first time on an Apple device, they will require minimum IOS 11.0. This is the minimum for 64bit operation, which is now a requirement for apps on the Apple App Store. The old version of the Pure Connect app is available on devices running IOS 6.1 - IOS 10. However its not possible to download this unless the device in question has downloaded it once before. 

Its available on Android devices version 2.3 and up. 

You can get the App from the Apple Store or Google Play. Streaming is controlled entirely from the App.