You need a PC or laptop with a webcam and microphone. You need to have Google Chrome or Microsoft Edge browser installed on it. You also need a smartphone with Android 4.1 or higher, or iOS 8.0 or higher.
Your Internet connection should be stable and have an upload speed of at least 1 Mb/sec.
⚠️You can't replace your PC or laptop with a tablet running a mobile operating system like Android or iOS. That won't work. 😉