These robots have x-ray vision, thanks to WiFi
The concept of using WiFi signals to create a map of an inside object (room) has been there for quite some time.
They are refining the algorithms that detect and make sense of the tiny variations in WiFisignals and reducing the size of the gadgets.
After all, WiFi is quite ubiquitous in our modern-day “jungle” š
http://o.aolcdn.com/hss/storage/midas/91913e2a076bf7fd45e776b899b9d375/200535873/robots-wifi-walls.jpg
http://www.engadget.com/2014/08/05/robots-wifi-xray-see-through-walls/