That's important, because although they are able to hear chainsaw noises up to a kilometer in the distance, allowing them to cover about three square kilometers, if someone were to take them, it would make the area unprotected.
Ini penting, karena meski alat ini bisa mendengar suara gergaji mesin dari sejauh satu kilometer, sehingga melingkupi luas area kira-kira 3 km persegi, jika seseorang mengambilnya, area itu jadi tidak terlindungi lagi.