I have two base stations with old and new models. How many should I use?

[michaelhuo]

My old model base station has Siren, but the new one does not.

Now I am using two of them. What would be your suggestions?

[JamesC]

There is no limit to the number of base stations/SmartHubs you can use on your Arlo account. Many users utilize multiple base stations to allow for strategic positioning throughout a location to ensure their cameras have the best signal strength.