The T4 family, RFID transponder reading and writing devices, allows users to read and write almost all 125kHz/ 134.2kHz and 13.56MHz tags and/or labels. These devices are compatible with most transponders of various suppliers, such as ATMEL, EM, ST, NXP, TI,HID,LEGIC, etc. and with ISO standards, such as ISO14443A (T=CL), ISO14443B (T=CL), ISO15693, ISO18092/ECMA-340 (NFC).The new RFID tag readers/writers represent a direct improvement of the established TWN3 family, while maintaining mechanical and protocol compatibility. The Desktop device allows host communication via USB or RS232 connector.