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Item specifics Brand Name:OBO Hands Card dimensions:85.5 x 54 x 0.84mm(ISO Credit Card Size). Material:PVC Standard:125KHz T5577 Re-writable Cards. Chip:T5577 Working Frequency:125KHz T5577 RFID Smart Cards Description: Chip: Atmel T5577 Function: Read/Write(protected by password) Memory size: 330-bits EEPROM(10 blocks, 33-bits each) Frequency: 125KHz RF Protocol: N/A Applications: Hotel key card,Access control systems,Time attendance system Package includes: 20 x 125KHz T5577 RFID Cards (White) NoteThis card requires a card reader to write. The meaning of writing is just writing the inner code, not writing other data. The Android Mifare Classic Tool and NFC Tools just writes data, such as date, name, etc.