I got the hub without speaker. So far, so good. I need a few more sensors though. I might buy another 4 pack and hub from Amazon even if I don't use the 2nd hub. it's the cheapest price for the sensors I've found. Would there be any benefit to having a hub on the main level and a 2nd one on our lower level and connect the sensors to the hub on the same level? Or just go with the single hub and 8-10 sensors connected to it from both levels?