It says it uses wifi. There are $5 wifi modules, which I guess would have enough processing to remember your wifi, and do 1 HTTP request, and (in volume) should

It says it uses wifi. There are $5 wifi modules, which I guess would have enough processing to remember your wifi, and do 1 HTTP request, and (in volume) should be feasible for $10. A spark core (which has a bit more functions), costs $20 retail.