The 32u4 433MHz RFM69HCW Packet Radio supports wireless networks that extend past 2.4GHz 802.15.4. The packet radio is also more flexible than Bluetooth LE and without the high-power requirements of WiFi.
The design is based on the ATmega32u4 processor, clocked at 8MHz and at 3.3V logic. The chip offers 32K of flash and 2K of RAM. The built-in USB provides USB-to-Serial program and debug capability. To support portable projects, the development board includes a connector for Adafruit 3.7V lithium polymer batteries and built-in battery charging.