Unfortunately, I cannot guarantee it, but as far as I remember I read somewhere that - if there are several devices in the reception area - they search for a free frequency when pairing.
In any case, I can recommend the device as such without any ifs and buts.

The advantage of DECT devices is that several devices can be operated in parallel without interference. This is particularly advantageous in apartment buildings. In practice, about 70 devices can be operated in parallel.