Standard baby monitors normally have a 3-5” screen and a camera, and they are almost always communicating on a low-frequency (lower than WiFi) radio signal direct from the camera to the monitor. They usually have poor image quality, are limited in range, and lack other features like record/rewind. You cannot access these outside their limited range.In the past decade, mobile app-based cameras have become popular. These cameras don’t come with a dedicated monitoring device, and you have to use an app on your phone or tablet to access the stream. You may hear these cameras called ‘IP cameras’ (internet protocol) because they transmit the video & audio from the camera through that company’s (or a 3rd party’s) cloud, then back down to the app on your phone.