The Department of Homeland Security has unveiled a new two-way radio replacement system for firefighters that's designed to work in extreme heat and disaster situations--and is disposable. WISPER is a tiny, one-inch square disposable router that is waterproof and heat-resistant up to 500 degrees Farenheit. Each contains an integrated two-way digital radio, antenna, and 3-volt lithium cell. The devices were developed for the DHS by Hawaiian firm Oceanit Laboratories and the University of Virginia's Department of Computer Science.