This is the Adafruit Feather M0 RFM96 LoRa Radio (433 MHz). We call these RadioFruits, our take on an microcontroller with a "Long Range (LoRa)" packet radio transceiver with built in USB and battery charging. Its an Adafruit Feather M0 with a 433MHz radio module cooked in! Great for making wireless networks that are more flexible than Bluetooth LE and without the high power requirements of WiFi. Feather is the new development board from Adafruit, and like its namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores.We have other boards in the Feather family, check'em out here. This is the 433 MHz radio version. We also sell a 898/915 MHz version of the same radio chipset! 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 new Arduino Zero. This chip has a whopping 256K of FLASH (8x more than the Atmega328 or 32u4) and 32K of RAM (16x as much)! This chip comes with built in USB so it has USB-to-Serial program & debug capability built in with no need for an FTDI-like chip. To make it easy to use for portable projects, we added a connector for any of our 3.7V Lithium polymer batteries and built in battery charging. You don't need a battery, it will run just fine straight from the micro USB connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically switch over to USB power when its available. We also tied the battery thru a divider to an analog pin, so you can measure and monitor the battery voltage to detect when you need a recharge. Here's some handy specs! Like all Feather M0's you get: Measures 2.0" x 0.9" x 0.3" (51mm x 23mm x 8mm) without headers soldered in Light as a (large?) feather - 5.8 grams ATSAMD21G18 @ 48MHz with 3.3V logic/power No EEPROM 3.3V regulator with 500mA peak current output USB native support, comes with USB bootloader an