The document discusses various security and data transmission devices, including a portable card-size transmitter that uses a proprietary protocol for unidirectional transmission at 230Kbps, an embedded receiver that also transmits unidirectionally at 230Kbps, and a PC card transceiver that can transmit bidirectionally at 10Mbps using TCP/IP and connects to devices via PCMCI. It concludes that red tacton technology is the best for data communication today as it uses the body as the transmission medium and has no risk of hacking.