Impinj M4E and Impinj M4QT are RFID UHF chips with large memory capacity. The EPC area of​the M4E chip is 496 bits, while the M4QT has 512 bits of user area memory, which is very suitable for special scenarios where large amounts of data need to be written. The performance and reading distance of the UHF RFID hard tags made with this type of UHF RFID chip are very good, and they are often used for industrial equipment identification management,special asset management,logistics information management,etc.