Two-way audio feature can be used without Wi-Fi, but the ability to remotely access and communicate through the camera will be limited. Without a Wi-Fi connection, the camera will only be able to record and store footage to its internal memory or SD card. To access the footage, you will need to physically retrieve the memory card from the camera and view it on a computer or other device.
However, some two-way audio hidden cameras have the ability to create their own Wi-Fi network, allowing you to connect to the camera directly through your smartphone or other device. This can be useful in situations where a Wi-Fi network is not available, such as in remote locations or outdoors. Keep in mind that this will also limit the range of the camera’s signal, so it may not be suitable for large areas.