*Dual-core ARM Cortex M0+ processor, running up to 133 MHz
*264KB of SRAM, and 2MB of on-board Flash memory
*Castellated module allows soldering direct to carrier boards USB
*1.1 Host and Device support
*Low-power sleep and dormant modes
*Comprehensive C/C++/Micropython SDK, software examples,
*Drag & drop programming using mass storage over USB
*26 × multi-function GPIO pins
*2 × SPI, 2 × I2C, 2 × UART, 3 × 12-bit ADC, 16 × controllable PWM channels *Accurate clock and timer on-chip
*Temperature sensor
*Accelerated floating-point libraries on-chip
*8 × Programmable I/O (PIO) state machines for custom peripheral support