> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/products/dynafamily-mms-dyna-devices/dynaflex-ii-go.md).

# DynaFlex II Go

The DynaFlex II Go is a portable secure card reader authenticator (SCRA) that\
reads contact chip, contactless (NFC), and magnetic-stripe cards in a compact,\
handheld device. It encrypts cardholder data at the point of read (SRED) and\
connects over USB or Bluetooth LE — suited to both mobile and countertop\
acceptance. It uses the shared Dyna-family MMS command set, so everything you\
build against it is documented in the [<mark style="color:red;">**API & Command Reference**</mark>](https://developer.magtek.com/api-and-command-reference) and linked below.

### Key Capabilities

* **Contact, contactless (NFC), and magnetic stripe** card reading in one device
* **SRED** point-to-point encryption at the moment of read (TDES / AES DUKPT)
* **NFC/MIFARE** pass-through and NFC card emulation (DynaCast)
* **Optional barcode reader** (BCR) for scanning outside a transaction
* **Portable and battery-powered**, with status LEDs and a buzzer for prompts
* **PCI PTS POI**–approved SCRA (no PIN entry — see the DynaFlex II PED for PIN)

### How it Connects

<table data-header-hidden><thead><tr><th valign="middle"></th><th></th></tr></thead><tbody><tr><td valign="middle"><strong>Reference Section</strong></td><td><strong>Information Available</strong></td></tr><tr><td valign="middle"><a href="/pages/QEX1CfWd6Ii4hawRxmR3"><mark style="color:red;"><strong>Quickstart</strong></mark></a></td><td>The Go connects to a host over USB or Bluetooth LE. For wiring, pairing, and a first end-to-end transaction, start with the Quickstart.</td></tr></tbody></table>

### Build with the DynaFlex II Go

<table data-header-hidden><thead><tr><th valign="middle"></th><th></th></tr></thead><tbody><tr><td valign="middle"><strong>Reference Section</strong></td><td><strong>Information Available</strong></td></tr><tr><td valign="middle"><a href="/pages/AZcEdhE5QNENGnafSmSQ"><mark style="color:red;"><strong>Programmer's Manual</strong></mark></a></td><td>The MMS command set scoped to<br>the Go: message format, commands, notifications, configuration, and status codes.</td></tr><tr><td valign="middle"><a href="/pages/j6oI1VZU6l0l79qs7bQq"><mark style="color:red;"><strong>Commands</strong></mark></a></td><td>The commands the Go supports, each<br>linking into the shared reference.</td></tr><tr><td valign="middle"><a href="https://developer.magtek.com/api-and-command-reference/dynafamily-command-matrix"><mark style="color:red;"><strong>Command Support Across Products</strong></mark></a></td><td>The full device Command matrix, if you're building for more than one Dyna reader.</td></tr><tr><td valign="middle"><a href="/pages/wsm38RxWQwaimmAV49VQ"><mark style="color:red;"><strong>Security &#x26; Keys</strong></mark></a></td><td>DUKPT (3DES→AES),<br>MAC, KSNs, encryption/decryption, and PCI requirements.</td></tr><tr><td valign="middle"><a href="/pages/1GuUYJ7wXOwkDfujMdYl"><mark style="color:red;"><strong>NFC/MIFARE</strong></mark></a></td><td>working with contactless cards and tags <br>(NTag, Classic, DESFire, Plus).</td></tr></tbody></table>

### Downloads & Compliance

<table data-header-hidden><thead><tr><th valign="middle"></th><th></th></tr></thead><tbody><tr><td valign="middle"><strong>Reference Section</strong></td><td><strong>Information Available</strong></td></tr><tr><td valign="middle"><a href="/pages/6nO9fDuiORkhQwur66IW"><mark style="color:red;"><strong>Firmware &#x26; Downloads</strong></mark></a></td><td>The MMS command set scoped to<br>the Go: message format, commands, notifications, configuration, and status codes.</td></tr><tr><td valign="middle"><a href="/pages/5ykeOzXmv8vcfX9KhqYt"><mark style="color:red;"><strong>Compliance</strong></mark></a></td><td>Compliance documentation for the Go, including inspection documents.</td></tr></tbody></table>

### For more help

{% hint style="info" %}
**Need Help?**

For additional support, please contact MagTek Support:

**Technical Support:**

* 📧 **Email:** [support@magtek.com](mailto:support@magtek.com?subject=Support%20Request)
* 📞 **Phone:** 1-562-546-6800 (US)
* 🕐 **Hours:** Monday-Friday, 5:30 AM - 5:00 PM PST

**Online Resources:**

* 🌐 **Support Portal:** developer.magtek.com

**Documentation Feedback:**

Help us improve this documentation! [feedback@magtek.com](mailto:feedback@magtek.com?subject=Feedback)
{% endhint %}


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