Any ideas what this guy is using here ? subwoofer and bluetooth upgrade

Hi, just got an almera and wanted to add bluetooth in and subwoofer out of the stock radio if possible and had no luck about how to do that and saw this video of a guy who managed it while keeping the headunit stock.

any idea how to go about this ? I get the idea of using bluetooth in on the cd changer bus but how does he get a sub to work with it ?
 
looks to me like some sort of bluetooth hands free kit judging by the mic on the steeringwheel casing, it would suggest that it has a bluetooth reciever and transmitter
(in from phone and out to sub?) some kits only have bluetooth recievers
 
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