Alexa

Despite his fear of government surveillance and harassment, Tony is a big fan of smart home technology. He often communicates with his Alexa, to the point of leaving several thousand notes on the device. He also starts many videos by saying the iconic line "Alexa, what's the time? Alexa, what's the date?". He sometimes has an antagonistic relationship with Alexa, like when he believes that his communications with her are being cut short (character limit on the notes app), or when she randomly starts playing music.

Tony presumably uses his Alexa to communicate with the various cameras both inside and outside his house.