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Supports 2.4 GHz Wi-Fi (802.11 b/g) and Bluetooth5(LE) with on-board antenna Built-in 512KB and 384KB ROM, 8MB PSRAM and external 16MB On-board 2-inch high-definition LCD screen, 240x320 resolution, 262K color, can clearly display color pictures. On-board Micro-SD card slot and camera interface, built-in ST7789T3 display driver chip, SPI interface communications On-board 3.7V MX1.25 Li-ion battery charge/discharge interface