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About ESP8266 ESP-01 ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area. About CH340 USB-Adapter Using CH340 serial interface chip, stable performance and good compatibility. 1000uF polymer capacitor ensures power supply so WiFi module will not crash because of power problems. Using 3255 crystal oscillator, which can enhance working stability of serial port. Used for connecting ESP8266 and computer via serial port. Transfer a USB port into a ESP8266 serial port Specifications: - Size ESP-01: 24.8 x 14.3 x 2.54 mm - Size USB-Adapter: 48 x 17 x 13 mm - 802.11 b/g/n - Flash memory can be used: 1MB - Operating voltage: 3.0-3.6V (recommended 3.3V) - Wi-Fi Direct (P2P), soft-AP - Integrated TCP/IP protocol stack - Integrated TR switch, balun, LNA, power amplifier and matching network - Integrated PLLs, regulators, DCXO and power management units - +19.5dBm output power in 802.11b mode - Power down leakage current