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hese displays are small, only about 1" diameter, but very readable due to the high contrast of an OLED display. This display is made of 128x64 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast; we really like this miniature display for its crispness!
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ESP32 is already integrated with antenna and RF balun, power amplifier, low noise amplifiers, filters, and the power management module. The entire solution is the least amount of PCB area. this board is 2.4 GHz dual mode WiFi and bluetooth chips by tsmc 40nm low power technology, power and optimized RF characteristics, which is safe, reliable, and scalable to a wide range of applications.