ITEM NAME:V3.0.0 WIFI Internet Of The Things Development Board for Description: This is a powerful Internet of the things development board, standalone board mount, stackable on top, or stackable top and bottom. 11 digital input/output pins, all pins have interrupt/PWM/I2C/one-wire supported(except D0);1 analog input(3.2V max input).Micro USB connection. Although these D1 Minis have only 16 pins, you're still getting 10 digital I/O and the one A0 analog pin, a reset pin, plus the ground and one 3 volts and one 5 volt pin. This D1 definitely fits on a standard breadboard leaving one open hole available for each pin (on both sides) but being shorter than the 30 pin boards you will have about 6 more rows available for prototyping, especially nice when using the short 460 tie point breadboards. Optimize the circuit. Compatible with MicroPython, , Nodemcu. Specification: Material: Electronic Component Packaged Size: 13x11x3cm / 5.12x4.33x1.18inch Package Includes: 1 Piece Development Board 2 Pieces Long Female Pins 2 Pieces Short Female Pins 2 Pieces Normal Pins Note: The color might be slightly different due to the color calibration of each individual monitor. Please allow a slightly measuring deviation due to manual measurement..Optimize the circuit. Compatible with MicroPython,, Nodemcu. Although these D1 Minis have only 16 pins, you're still getting 10 digital I/O and the one A0 analog pin, a reset pin, plus the ground and one 3 volts and one 5 volt pin.