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ESP32 development board, Support arduino IDE, WIFI 802.11 b/g/n/e/i, Transmit power: 19.5 dBm@11b, 16.5 dBm@11g, 15.5 dBm@11n Operating voltage: 3.3V to 6V. Can be charged directly with a lithium battery Integrated dual-mode bluetooth: traditional bluetooth and BLE low power bluetooth Onboard 4MByte(32M-bit) Flash, 0.96-inch blue OLED display, lithium battery charging circuit and interface, CP2102 USB to serial chip, the perfect support for Arduino development environment. Micro usb port, easy to connect. The package contains a USB cable, you don't have to worry about which cable to use.