Using RP2040 microcontroller chip independently designed by Equipped with dual-core ARM MO+ processor, running frequency up to 133MHz flexible clock. Adopt 's CYW43439 wireless chip, support 2.4/5 GHz band Wi-Fi 4 wireless network. Built-in 264KB SRAM and 2MB on-chip Flash Stamp hole design, which can be directly welded and integrated into the bottom plate designed by the user Drag-and-drop program download via USB recognition as mass storage Up to 26 multi-function GPIO pins 2 SPI, 2 I2C, 2 UART, 3 12-bit ADC, 16 controllable PWM channels Accurate on-chip clocks and Temperature Sensor On-chip accelerated floating-point library 8 programmable I/O (PIO) state machines for custom peripheral support Color: green Material: PCB Package Contents: 1 x Development Board(No Welded) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.