---
title: "Model Specification"
slug: "model-specification-12"
updated: 2026-06-15T06:04:14Z
published: 2026-06-15T06:04:14Z
canonical: "knowledge.akuvox.com/model-specification-12"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.akuvox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Model Specification

| Model | S539 |
| --- | --- |
| Touch Screen | ✔ |
| Relay In | 3 |
| Relay Out | 3 |
| Alarm In | X |
| RS485 | ✔ |
| Card Reader | 13.56MHZ & 125KHZ |
| Wi-Fi | X |
| Bluetooth | ✔ |
| Temperature Detection | Optional |
| Face Recognition | ✔ |
| LTE | X |
| USB | X |
| External SD Card | X |

## Supported Card Types

The device’s firmware should be 539.30.10.316 or higher:

- Unencrypted ID Card:
  - EM4100
  - EM4200
- Unencrypted IC Card:
  - Mifare Ultralight C/EV1
  - Mifare Classic Compatible Card
  - Mifare Plus-S 2K
  - Mifare Desfire EV1 2K D21
  - Mifare Desfire EV2 D42
  - Mifare Desfire EV2 D22
  - Mifare Desfire Compatible Card (CPU Card, 4-byte): Incompatible with SmartPlus NFC service.
  - NFC Type2 216
  - NFC Type2 215
- Felica Card
- SmartPlus APP NFC
- Mifare Classic S50 4-byte Encryption-Compatible Card
- Mifare Plus-S SL3 Encrypted Card
- Mifare Plus-SE SL3 Encrypted Card
- Mifare Desfire EV1 Encrypted Card(AES file encryption mode)
- Mifare Desfire EV2 Encrypted Card(AES file encryption mode)
- Mifare Desfire EV3 Encrypted Card(AES file encryption mode)
- Akuvox Cards:
  - Mifare Classic 1K
  - Mifare S50-1K Card
  - Mifare Desfire EV3 Encrypted Card(AES file encryption mode)