Can this use the same SSID as my existing router?
So i won't have to change networks on devices when the signal gets weak as I move away from the main router.
It will use your current SSID and you can use your same password - however - it will create one or two more that have different "names" because they are actually different. I log in only to the extender no matter where in the house I am so I do not have to change networks.