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Supply voltage: 5V, Nominal Current Rating: 2 mA, Size: 41.4mm*19mm* 15.8mm (L*W*H), compatible with 1602 2004 LCD. IIC/I2C/TWI/SPI Serial Interface. with this I2C interface module, you will be able to realize data display with only 2 wires. This handy adapter module has fast transmission and can convert the parallel data transmission of an LCD display into a serial I2C signal. The adapter requires only 4 ports instead of 16 and has an additional 6 selectable IIC addresses, allowing simultaneous operation of up to 6 displays. Product include a total of 5pcs interface adapter, which can completely meet your daily use needs and replacement.