Availability: In stock
This is the Adafruit Feather M0 Adalogger - an 'all-in-one' Cortex M0 datalogger (or data-reader) with built in USB and battery charging. Its an Adafruit Feather M0 with a microSD holder. At the Feather M0's heart is an ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the same one used in the Arduino Zero / M0.
More information is available on the website of Adafruit.