ESP8266-12F Standards Certification: FCC / CE / TELEC Wireless standards: 802.11 b / g / n Frequency range: 2.4GHz-2.5GHz (2400M-2483.5M) Data interface: UART / HSPI / I2C / I2S / Ir Remote Contorl GPIO / PWM Operating voltage: 3.0 ~ 3.6V (recommendation 3.3V) Working Current: Average: 80mA Operating temperature: -40 ° ~ 125 ° Storage temperature: Nomal temperature 1. ESP8266-12F is an enhanced version of ESP8266-12. It improves peripheral circuits, four-layer board technology, enhances impedance matching, and provides better signal output. 2. Whether it is stability or anti-interference ability, the PCB antenna has been tested by a professional laboratory and perfectly matched. After ROHS certification, it has been greatly improved! 3. For users who have previously selected ESP-12, it doesn't matter if they have already made a product. The enhanced version is fully compatible with the previous firmware. 4. On the basis of ESP-12, the pins add six IO ports and SPI ports, which makes the development more convenient and more widely used! ESP8266-12E Model:ESP8266-12 ISM 2.4GHz PA +25dBm 802.11b/g/n Warnings: 1.This module requires a 3.3 volt supply for VCC, and 3.3V logic. 2.It is not 5V tolant,Connect RX or TX on 5V FOR Arduino will destroy this module. 3.You must use a logic level converter, or a 3.3V FOR Arduino 4.The 3.3V supply on the FOR Arduino Uno has inadequate current capabilit to power this module. 5.You must provide a separate,higher 3.3V supply(about 300mA or better) The pin definition diagram is as follows: *ESP8266-12 enhanced version ESP8266-12F can refer to the above pin definition diagram!