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Features: The chipset that incorporates is the ESP32-WROOM-32 and a chipset for the CP2104 serial port with 4 megs of space for development. Power supply voltage (USB) 5V DC Micro USB connection; Compatible with Arduino Input/Output voltage 3.3V DC Operating current min. 500mA RAM 512kB I/O Pins 34 Package Including: 3* ESP32 mini ESP-WROOM-32 Development Board