Overview
Dual‑technology ISO access card combining a 13.56 MHz MIFARE DESFire (EV2 family) contactless chip with a 125 kHz proximity chip. Designed for sites with mixed legacy and HF readers — printable PVC ISO‑format card (ISO‑CR80).

• Dual‑technology — MIFARE DESFire EV2 (HF) + 125 kHz proximity for compatibility with mixed reader fleets.
• ISO format — 85 × 54 mm (ISO‑CR80), typical thickness ~0.8 mm; printable PVC surface for on‑site visual ID or encoding.
• Printable — printable both sides on many CDVI dual‑tech variants (suitable for visual customisation or on‑demand printing).
• Use cases — migration projects, mixed‑reader access control, visitor / staff ID, integrations where both proximity and smart card readers exist.

What is confirmed vs inferred
Specifications above are based on CDVI’s published dual‑technology ISO card family (ISODT25 / CSDT pages). The exact SKU S280‑MI page was not located during review; where product family attributes are used to describe S280‑MI this is noted as representative of CDVI dual‑tech ISO cards.

Compliance & safety
Certification details (CE / UKCA / other) are not confirmed for SKU S280‑MI — please request the official datasheet or vendor confirmation before specifying for regulated projects.

Installation & handling
Cards are passive credentials; follow standard access control provisioning and encoding procedures. Avoid prolonged exposure to extreme heat or solvents that could damage printable surfaces or embedded chips.