Gotcha ya that switch is called the gateway or more like the brain really and NOT cheap!. It has a cellular connection as well as wifi and ethernet. As it's leased some options are N/A but you can log into it pretty easy just type it's ip and enter your tesla password and you can see real time usage and as it stays on the LAN you can still use it that way if your internet is out unlike the app.

https://www.tesla.com/support/energy/powerwall/own/connecting-network