5V power supply. Serial I2C control of LCD display using PCF8574. Backlight can be enabled or disabled via a jumper on the board. Contrast control via a potentiometer. Can have 8 modules on a single I2C bus (change address via solder jumpers)address, allowing.
1GHz single-core CPU 512MB RAM Mini HDMI® port Micro USB OTG port Micro USB power HAT-compatible 40-pin header Composite video and reset headers CSI camera connector (v1.3 only)