The EM4126 from EM Microelectronic is a RFID Tag IC with Frequency 860 to 960 MHz, Operating Temperature -40 to 85 Degree C, Read sensitivity --21 to 19 dBm, Storage Temperature -50 to 125 Degree C, Write sensitivity -8 dBm. Tags: Passive. More details for EM4126 can be seen below.