Proximity Card (Passive RFID) — The card uses 125 kHz HID proximity technology (or compatible) — it does not require a battery; the reader powers it via radio‑frequency when presented.

Standard Credit‑Card Size & Thin Profile — Typically ISO‑standard dimensions (≈ 85 × 54 mm; thickness ≈ 0.03 in or ~0.8 mm), making it easy to carry in wallet/pocket or badge‑holder.

Read‑Only / Read‑Only (non‑rewritable) Format — Usually provided pre‑programmed with a unique ID; not meant for repeated data‑writing on‑card (unlike smartcards).

Compatibility with HID / ZK / 125 kHz Readers — Works with access‑control card readers that support 125 kHz HID‑prox standard (and often with many generic 125 kHz / prox readers).

Slot / Badge‑Punch Option — Often supplied with a slot punch (vertical or horizontal) so it can be used with lanyards, badge clips or ID‑card holders.

Durable PVC Construction — Made from rigid or semi‑rigid PVC (or similar plastic), suitable for repeated use over time.

Cost-Effective & Easy Credentialing — Since the card is thin, passive, pre‑programmed and requires no maintenance, it’s a low‑cost credential for offices, residential gates, parking gates — ideal when you need simple entry control without fancy features.

Low Profile & User‑Friendly — Its slim “card” format allows carrying in wallets or badge‑holders, making it very convenient for users (unlike bulky clamshell cards or key‑fobs).