The CS6821 from Convergence Systems Limited is a RFID Tag with Operating Frequency 860 to 960 MHz, EPC Memory 128 Bit (96-bit self pre-serialization), TID Memory 96 Bit (48-bit factory encoded unique serial number), Operating Temperature -35 to 50 Degree C, Storage Temperature -40 to 60 Degree C. Tags: RFID Card. More details for CS6821 can be seen below.