The 21mm x 26mm RP204 boards have USB Type-C connectors and integrated boot and reset select buttons.
They also have LEDs on them, one for power identification and another RGB LED for debugging. Of the 20 castellated pins, three are for power and the remaining seventeen are used for pinout of GPIOs and MCU peripheral interfaces.
Each of the 5 MCU boards: the ESP32 S3, ESP32 S2, ESP32-C3, ESP32-C6 and Pico RP2040 have unique features and capabilities. They feature WiFi, Bluetooth, Zigbee, and various digital and analog interfaces.
The boards are available for use in robotics, smart home devices, and IoT devices. In addition to the starter kit and various sensors, a microdevelopment kit is available. The micro development kit is a PCB with buttons, LEDs, a 170-pin breadboard, a 1.3-inch LCD display, a buzzer, a potentiometer, and additional pins for power supply wiring. Overall it provides a platform for users to experiment with different circuits and test their code.
Those interested can check out the Kickstarter page. A single board will cost between $7 and $10, and for a combination of all five boards along with a chip development kit, you'll need to pay around $58.