ITEM NAME:ESP8266 WiFi Bluetooth Development Board Oled 0.91 Inch Display Iot Module X8W8 ESP8266 WiFi Bluetooth Development Board Oled 0.91 Inch Display Iot Module X8W8 the master chip using ESP8266, with CP2104 USB to serial chip, lithium battery interface and charge and discharge circuit, 32MByte Flash, WIFI antenna, 0.91-inch OLED display. Can be programmed for Arduino and NodeMCU environments. Operation is consistent with NodeMCU. Leads all pins of ESP8266 12 digital pins can be configured to read, write, IIC, SPI, the middle, PWM and other functions 1 AD input Integrated 0.91-inch 128 * 32 OLED Working voltage: 3.3V ~ 7V Color: picture color Material: PC + metal Package Contents: 1*ESP8266 WIFI Bluetooth Development Board