0.91 INCH OLED Display: Resolution is 128*32,Very Clear,Black background with blue text display. | IIC(I2C) interface: Only 4 PIN( VCC, GND, SCL, SDA), Simpler than SPI interface Screen, you can leave more ports for connecting other sensors. | Sample Code and Technical Support: You can drive this display through the u8glib library. DSD TECH also provides complete sample code and instruction manuals. you can drive this OLED screen in half an hour, | The main chip is SSD1306; supports DC 3.3V to 5.0V supply. Working Temperature: -30 degrees ~ 70 degrees | About Warranty: DSD TECH offers 1 year warranty and lifetime technical support.If you meet any question, Please contact us, we will fix your issue within 24 hours.