jˈuːzɪŋ ɹˈɔː sˈɪɡnəlz tɹænsmˈɪɾᵻd baɪ ðɛɹ sˈɛnsɚz, ðeɪ ɑːɹ ˈeɪbəl tə klˈæsᵻfˌaɪ dˈɪfɹənt wˈɔːl tˈaɪps æz wˈɛl æz ðə mətˈɪɹiəl bᵻhˌaɪnd ðə wˈɔːlz.
Using raw signals transmitted by their sensors, they are able to classify different wall types as well as the material behind the walls.