Adafruit Feather 32u4 Bluefruit LE _RPI_HAT they will all apply to

they will all apply to the Raspberry Pi Model B+ and the Raspberry Pi 2 and 3

The board includes pre-soldered 5V level shifters

Coin cell battery backup for years of operation without main power

Micro USB power boost port for extra pixel brightness

To write your own programs

Adafruit Feather 32u4 Bluefruit LE _RPI_HAT they will all apply toThe Adafruit Feather 32u4 Bluefruit packs Arduino compatibility, Bluetooth Low Energy, USB, and battery charging into a slim, portable boardperfect for phone controlled and wireless projects. Feather is Adafruits lightweight development board platform, designed to be thin, portable, and ideal for battery powered projects. The Adafruit Feather 32u4 Bluefruit combines an Arduino compatible microcontroller with Bluetooth Low Energy, built in USB support,