Features: Made from high-quality PCB-material, the mini D1 PRO boasts improved performance and enhanced features for seamless- development experience. 11 digital input/output pins-, all with interrupt-/PWM/I2C/A supported cables- (excludingD0) All IO-pins operate at 3.3V, except forD0, and all IO- supports interruption of PWM/12C single line Developing the SP8266 module- using the universal board ESP8266 Development Module- in the development board manager With its compact- size and easy-to-use interface, the mini D1 PRO is the ultimate- tool for bringing your creative- ideas to life. Specifications: Item：D1 Mini Pro Minimum ESP8266 Wireless Network Card 11 digital input/output pins-, all with interrupt-/PWM/I2C/A supported cables- (excluding-D0) Micro USB connection Compatible withArduino,programming with Arduino-IDE 1x ADC-pin (input 0-3.3V) Support OTA- Onboard5V1A switching power supply Size:approx 34.3X26.5mm/1.35x1.04in Package Includes: 1PC Mini D1 PRO Development Board note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.