Cucumber M is a WiFi IoT development board. It features the latest ESP32-S2 chipset from Espressif (ESP32-S2-WROOM). M version is using integrated PCB antenna. It is packed with many goodies. I.E. x2 USB Type-C (debug and OTG), FTDI chip for USB-to-Serial converter which highly compatible with most computers, RGB LED which use only one signal line and can mix up to over 16 million color, TX/RX, IO2 and PWR LED, colorful sticker indicate the pin function. Cucumber M come in a nice clear plastic box for ease of storage. All these functions in less than $14USD.