Engineers at Purdue University in West Lafayette, Indiana are working to develop a grain-sized wireless device that the doctors can implant in the tumors to notify them with the exact dose of radiation and the location of the tumor. The wireless device dubbed as the “passive wireless transponder” is activated by placing electrical coils around the body to identify the precise location of the tumor. Well, the technology works just like the commercial microphones. The wireless device features a tiny version of the dosimeters. When the electrical foil is placed near the body, the signals are produced that sent the info from the dosimeter to a receiver.