The RedBearLab Wi-Fi Micro is made based on CC3200 module by Texas Instruments (TI). The target MCU is TI CC3200, the industrys first single-chip ARM Cortex-M4 core MCU with built-in Wi-Fi connectivity. With on-chip Wi-Fi, Internet, and robust security protocols, no prior Wi-Fi experience is required for faster development. They are offered to make you quickly produce prototypes and demos target for not only Internet of Thing (IoT) but also many other exciting and interesting projects. Such as Wi-Fi camera, Wi-Fi Audio, TFTP Client, TCP/IP OR UDP Server/Client, Http Server, XMPP Client, mDNS, etc.
The CC3200 Wi-Fi consists of applications microcontroller, Wi-Fi network processor, and power-management subsystems:
Applications Microcontroller Subsystem
The power-management subsystem includes integrated DC-DC converters supporting a wide range of supply voltages. This subsystem enables low-power consumption modes, such as the hibernate with RTC mode requiring less than 7uA of current.
MK20 USB Board
The MK20 (Freescale MK20DX128VFM5) USB board acts as a dongle, it accepts 5V from USB port and regulates to 3.3V via the onboard LDO which can be used to power BLE Nano. It appears on your computer as both a serial port and a removable mass storage disk.
Since the BLE Nano can work as low as 1.8V, we have designed the MK20 USB board to run at 1.8V as well, simple short the switch S, then the regulator will outputs 1.8V instead. This would allow your BLE Nano to work with 1.8V components.