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But instead of using echolocation, the machines employ a 3-D-printed remote sensor that bounces radar pulses in various directions.

As I’ve said, the main reason to buy an Ecobee is the remote sensor integration, and there’s lots of competition here, with Nest, Wyze, and Honeywell Home all offering remote sensors.

The T9 costs $199 and comes with one remote sensor in the box, with support for up to 20.

Meanwhile, in the Trump years, the militarization of the border has become a particularly lucrative business opportunity, with General Atomics, for instance, supplying ever more surveillance drones and General Dynamics supplying an ever more intricate and expensive remote sensor surveillance system.

The T9 comes with one remote sensor in the box, and it has to be mounted on a wall.