I forgot to mention the controller 69 is available in local wifi or Bluetooth, not both.
The Controller 69 kicks ass.
I bought the 67 when they first came out and managed to get the Controller 69 Pro a few months ago. AC Infinity has
an excellent product on their hands makes some excellent products and the Controller 69
and it's is going to cause "all sortsa hell" for Inkbird and Pulse. I use two Inkbirds and a PulseOne. The Inkbirds will be retired in a few days and I'll keep the Pulse running (for very specific reasons) but, if I were starting a new grow, I'd take the Controller 69 over the others, no doubt about it.
Re the networking in the Controller 69 - the Bluetooth model is $30 less than the WiFi model but the WiFi model is well worth the $30 unless a grower is absolutely sure that they will not want to be able to control your grow from more than 30' from the Controller.
"WI Fi LOCAL networking" vs Bluetooth - Bluetooth is a "point to point" protocol meaning that one device communicates directly with another device. Some devices can be connected to by more than one other device at a time (I think that's a feature of the newer Bluetooth protocol) but in most cases, it's one on one, eg a mouse communicates directly with a computer, a watch communicate directly with a phone, etc. "pairing" the devices sets up each device so that it knows about the other device and that it can communicate in a secure manner. And Bluetooth is, by design, limited to "short" range. (Checking Google, the original 10 meter range has been increased to 240 meters with Bluetooth 5.0.)
"LOCAL wireless" is a misnomer.
All WiFi is "local" in that it can only run on one network. The key is that, unlike Bluetooth, which is "point to point", WiFi traffic is "routable". A "host" (a device that is capable of communicating on a TCP/IP network) on a WiFi network communicates with the router and the router routes the packets to the appropriate host or hosts on that network. If the traffic is destined for a computer on another network, routers handle moving the packets from one network to another. As of about 50 years ago, we started laying the groundwork for a world wide network of connected networks that we call "the internet". In contrast to the "internet", which moves traffic between networks, the word "intranet" is/was used to describe the network(s) that run within a given organization.
I don't mean to be pedantic but that's the basic view of Bluetooth vs WiFi. They're both great technologies and each has their own strengths and weaknesses.
And, yeh, the Controller 69 is primo, in my book.