This ESP8266 OLED development board with 0.91 Inch 128*32 OLED Display, the display color is white, with WIFI, You will have an advanced and fun development environment! It has 12 digital pins that can be configured to read, write, IIC, SPI, the middle, PWM, and other functions; 1 AD input
 : Specifications 
Working voltage: 3.3V-7V
Main chips: esp8266 chip, cp2102 chip
Onboard 2.4GHz (for Wi-Fi) PCB antenna
Micro USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures
Onboard SH1.25-2 battery interface, integrated lithium battery management system
Onboard 0.91-inch 128*32 dot matrix OLED display, which can be used to display debugging information, battery power, and other information
Compatible with the Arduino development environment
Product dimensions : 2.01 x 0.71 x 0.31 inches