Duo is a thumb-size development board made to simplify the building process of Internet of Things (IoT) products. Everything you need is built into the Duo. It contains WiFi, BLE and Cloud, all in a compact form factor that makes it ideal for your first prototype, a finished product, and everything in between.
With the help of RB Link, a RedBear expansion board, you can attach add-on modules without any soldering at all. You can get your prototype up and running in no time.