Can it be used only with Wi-fi communication?

It is also possible to use Wi-Fi only. However, please be aware of the following three points

①If the Wi-Fi security is strict: You may not be able to communicate unless you change the FW settings.
② If the communication speed supported by your device is slow: Conversations may be interrupted.
③For 2.4GHz WiFi: It may not automatically return to WiFi. We have confirmed that 5GHz WiFi will automatically reconnect to WiFi, so if you want to automatically connect to WiFi while using a voice app, please prepare a 5GHz WiFi.