Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz ^^ 264KB of SRAM, and 4MB of onboard Flash memory. Onboard CH9120 with integrated TCP/IP protocol stack ^^ 14 multi-function GPIO pins, compatible with some Pico HATs. Castellated module allows soldering direct to carrier boards ^^ Drag-and-drop programming using mass storage over USB. Temperature sensor ^^ 8 Programmable I/O (PIO) state machines for custom peripheral support