Nest's $229 video doorbell is a useful addition to its ecosystem

As its name suggests, the temperature sensor works in conjunction with the Nest Thermostat (and the Nest Thermostat E) to let you control the temperature in individual rooms. So if you set one in the bedroom, for example, you can then configure the Nest app to have it so that room is colder or warmer than the rest of the house. The price for a single unit is $39 or $99 for a pack of three. You can pre-order it starting today, and it'll begin shipping next month. As part of the above announcement, Nest recently gave us a demo of some of its connected home products to walk us through some of the new features.