In DW2-RF, the contactor is desoldered… soldered wires, each wire in a separate thermoplastic sleeve with glue, the whole in an additional thermoplastic sleeve with glue.
In DW2-RF, a hole is cut for the cable.
The whole thing works on the principle that when the water level drops below a certain point, the sensor is opened and the DW2-RF sends a signal… the rest is based on scenes.
I use this to turn off the water pump so that it does not run dry.
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When using this sensor, you get water animation and it also supports scene creation when the device is offline.
It all depends on the strength of the signal, interference, etc. I still use one DW2-RF and works in 9/10 cases and recently I adapted 05p to this role but with zigbee there is also a risk that it can lose connectivity at a bad time.