ITEM NAME:MCP23017 16-bit I/O Expander with I2C IIC Serial Interface Module K6B1 MCP23017 16-bit I/O Expander with I2C IIC Serial Interface Module K6B1 16-bit remote.High-speed I2C interface (MCP23017). 1 x Expander. High-speed SPI interface (MCP23S17).