These have Bluetooth 5.0.
With Bluetooth 5.0, devices can use data transfer speeds of up to 2 Mbps, which is double what Bluetooth 4.2 supports.
Devices can also communicate over distances of up to 800 feet (or 240 meters), which is four times the 200 feet (or 60 meters) allowed by Bluetooth 4.2.
However, walls and other obstacles will weaken the signal, as they do with Wi-Fi.
So a number of factors come into play as to how far and how fast they work, but I roam freely in my three bedroom house with no issues so far when paired with my iPhone X.