Compact 802.15.4 Sub-GHz module ATSAMR30E18A SiP with ARM Cortex-M0+ MCU and Sub-GHz transceiver Integrated Ultra Low Power Transceiver for 700/800/900MHz ISM band 256 KB Flash 16 Input/Output pins Maximum operating frequency 48 MHz 128-bit Advanced Encryption Standard (AES) crypto engine 32-bit Medium Access Control (MAC) symbol counter Automatic retransmission modes Single 1.8V - 3.6V supply FCC / ETSI compliant RF front end with harmonic filter Two Serial Communication interface (SERCOM) units left for external applications High precision 16 MHz crystal oscillator 12-bit, 350 ksps analogue-to-Digital Converter (ADC) I2C up to 3.4 MHz Full-speed (12 Mbps) Universal Serial Bus (USB) 2.0 interface 16 External General Purpose Input/Output (GPIO) lines