A Wi-Fi connection is essential for the device to function. Without Wi-Fi, Vayyar Care will not work. If there is Wi-Fi in the home, you should be able to connect the device to the home network by pairing it through the Vayyar Care mobile app. If there is more than one network, choose the one with the strongest signal.
Please note that Vayyar Care works only with a 2.4 GHz Wi-Fi network. It will not work with a 5 GHz network.