This board has a PCF8574 I2C chip that converts I2C serial data to parallell data for the LCD display.

There are many examples on internet for using this board with Arduino. Do a search for “Arduino LCD PCF8574”. The I2C address is 0x3F by default, but this can be changed via 3 solder jumpers provided on the board. This allows up to 3 LCD displays to be controlled via a single I2C bus (giving each one it’s own address).

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
Size：41.6mm x 19.2mm