Everything
[http://www.amazon.com/Google-Chromecast-Streaming-Media-Player/dp/B00DR0PDNE/]
works off your smartphones these day;doorbells
[https://www.modalman.com/doorbot-smart-doorbell/], home systems
[https://www.modalman.com/honeywell-lyric/], and even lightbulbs
[https://www.modalman.