Adafruit Feather 32u4 Bluefruit LE

Key Features: ATmega32u4 clocked at 8 MHz and at 3.3V logic - same chip setup as the Flora USB native support, built in USB bootloader and serial port debugging - no need for an FTDI-like chip It can also act like a mouse, keyboard, USB MIDI device, etc. Hardware Serial, hardware I2C, hardware SPI support This is the Adafruit Feather 32u4 Bluefruit - an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging. Its an Adafruit Feather 32u4 with a BTLE module. Bluetooth Low Energy is the hottest new low-power, 2.4GHz spectrum wireless protocol. In particular, its the only wireless protocol that you can use with iOS without needing special certification and it's supported by all modern smart phones. This makes it excellent for use in portable projects that will make use of an iOS or Android phone or tablet. It also is supported in Mac OS X and Windows 8+.To make it easy to use for portable projects, it has a 3.7V Lithium polymer battery connector and b