Ultimately, no hidden cameras — especially those on this list — need WiFi to work. As for whether or not they have it, some do, some don’t, it depends on the camera. Even the cameras that support WiFi don’t necessarily need an active connection to record or playback video. Most cameras are designed to plug into a computer or phone to review playback. Also, they include SD card slots which means you can remove the microSD card and plug that into a reader to playback video. Both of these options mean you don’t need WiFi. For the cameras that do have WiFi, it simply offers another way to review footage.