It's an 8 year old SBG6580-2 with radio button selection for 2.4 GHz and 5 GHz on the web interface. I bought the cheapest one guaranteed to work with Xfinity to save on the rental costs. I'll upgrade when they force a move from DOCSIS 3.0. Just like I'll upgrade my cheapest smart phone with a replaceable battery when they force a move from 4G (or finally make a workable phone with a physical keyboard again).