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Hey, I want to buy a Sonos Connect for my two Sonos One, and I don’t know how to recognize Connect 1 or Connect 2 ? 
If you can tell me for this serial number for exemple : 1606-B8-E9-37-9F-20-34-9

 

and if you have tips for me thanks you 

In the serial number printed on the unit, the first 4 digits are YYMM of manufacture.  Your unit would be manufactured in 06/2016, and anything after 03/2015 is Gen 2.  You can also go here:

https://www.sonos.com/myaccount/user/offers/upgrade/

If the unit has an upgrade of 30%, it is Gen 1.  15% means Gen 2.