Features:Based on the I2C interface I / O expansion modules, using two I / O can be extended to eight I / O (up to simultaneous use 8 PCF8574, expanded to 64 I / O)Maximum Features: supports two types of Interface, access to the target board : Pin or row seat2 supports I2C bus cascade (via pin, row seat docking methods can be used simultaneously multiple I2C modules)Product Properties:Type: Modular/ Components and partsBand : noneInterface: I2CBoard Type: Pin or row seatSpecifications:Typical applications: for I / O resource constraints the MCU I / O expansionThe main resources: PCF8574, I2C interface, the 8-bit parallelSize:54*15mmNet Weight: 7gPackage Included:5x PCF8574 PCF8574T Communication Module