Thick ISSI4439 RFID Card Chip 1K Byte 13.56MHz ISO14443A 16 Sectors Rewritable for Access Control Systems Attendance Management

The ISSI 4439 Thick RFID Card is a 13.56MHz high-frequency contactless smart card compliant with the ISO/IEC 14443A standard. It features the ISSI4439 chip from ISSI (Integrated Silicon Solution Inc.) with 1K Byte (1024 Bytes / 8K bit) of memory, organized into 16 sectors, each containing 4 blocks of 16 bytes. This card is designed for access control, attendance management, identification, industrial automation, and public transit applications.Key Authentication ReminderBefore reading or writing to a sector, key authentication is usually required. Default keys are often FFFFFFFFFFFF or A0A1A2A3A4A5How to UseThe following are the basic operation steps for using a standard RFID reader (such as ACR122U) in conjunction with a PC software:Step 1：Connect the RFID reader to your PC via USB and ensure the driver is properly installed.Step 2：Launch the reader software (e.g., RFID Tools or manufacturer-provided software).Step 3：Place the ISSI 4439 card on the reader's antenna area (within 2–10cm).Step 4：Click “Find Card” or “Connect” in the software to read the card's UID.Step 5：Read: Select a sector and click “Read”. Write: Enter data and click “Write”.Step 6：Once complete, the software will show “Success”. Remove the card.