Specification: Origin: Mainland China Type: ESP-12E, ESP-12F,ESP-07, ESP-07S,ESP-01S (optional) Size: About 24x16x3mm/0.94x0.62x0.11inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x WIFI Module 1. Improved Circuitry and Signal Processing: The ESP8266-12F is an enhanced version of the ESP8266-12 that features improved external circuitry, a four-layer PCB production process, enhanced impedance matching, and better signal output. All these upgrades result in superior stability and resistance to interference. 2. Professional-grade PCB Antenna: The built-in PCB antenna has undergone extensive testing in a professional laboratory setting to ensure perfect matching and optimal performance. This has resulted in a significant improvement in the overall range and quality of the wireless signal. 3. Compatible with ESP-12 Firmware: Users who have already developed products based on the ESP-12 can rest assured that their firmware will work perfectly with the ESP8266-12F. Additionally, the ESP8266-12F offers six extra IO ports and SPI port outputs beyond those found on the ESP-12, making development even more convenient. 4. Wide Range of Applications: The ESP8266-12F is suitable for use in a wide range of applications. Its advanced features make it ideal for use in high-stress environments where stability and reliability are critical.