Contactless Smart Card (RFID / NFC) — Operates without battery: the card is powered and read by the reader via radio‑frequency.

Frequency: 13.56 MHz (HF) — Uses the standard high-frequency band for RFID/NFC communication.

Standard Protocol: ISO/IEC 14443‑A — Ensures compatibility with most readers designed for MIFARE / NFC cards.

Memory (EEPROM): 1 KB (1024 bytes) — Organized into 16 sectors (each sector containing multiple blocks), suitable for storing access credentials or small data.

Read / Write capable — Card can store data: supports reading from and writing to onboard memory (with correct access keys).

Unique ID (UID) — Each card has a unique identifier (serial number) embedded, which helps in identifying individual cards for access control, attendance, etc.

Contactless Data Transfer with Encryption / Security — Uses secure data exchange protocol (encryption, sector-based access keys) to prevent unauthorized reading/writing.

No battery required (Passive card design) — Card draws power from the reader’s RF field when within range — makes it low‑maintenance and long-lasting.

Operating (Read) Distance up to ~ 5‑10 cm (depending on reader antenna and environment) — Suitable for typical access control or RFID reader setups.

Durable, Standard Card-Size Format (credit-card sized) — Physically thin and compact (fits wallets, card holders), easy to carry and use.

Multi‑Purpose Use (Access, Payment, ID, Attendance, Transport, etc.) — Because of its writable memory, security, and standard format, the MIFARE S50 card can be used for many applications: building access control, attendance management, public transport, membership cards, parking systems, etc.

Long Data Retention & High Reliability — EEPROM memory can retain data for many years (commonly ~10 years), with many read/write cycles (e.g. up to 100,000 writes), making it reliable for long-term use.