90m as the crow flies (which is reduced to 10-30m if there are obstacles such as walls or other) but this is if they are connected directly to the homebase. There is also the possibility of connecting them via a wifi network from the same network to which the homebase is also connected. I placed a wifi repeater (Fritz!repeater) in the garden and connected those cameras to the homebase's wifi (instead of the direct connection to the homebase). This way the distance is practically infinite (you could also place the camera on the other side of the planet). ;o)

I assume that this refers to the WLAN connection. I can't say for sure. I have installed it on an alp with a SIM card router. The distance to the router is a maximum of 5 metres through a home wall. It works perfectly.