Check the listing for details. PCF8575 Expander Module I2C To 16IO. Condition: New. Listed at 8.13 USD. PCF8575 Expander Module I2C To 16IO Descriptions: Have you run out of I pins? This great module allows the user to expand up I using only two I for control! The PCF8575 is controlled through an I2C and features 16-bits of quasi-bidirectional input/output pins. On board 3.3V level converter circuit, if you donot solder VCC-VDD pad, the PCF8575 level is 3.3V. If you solder it, the level will be the same with VCC Features: Available library: PCF8575 Working Working current: 100mA I2C address: 0x20(default),can be modified by soldering and selection pads. 16 individually addressable pins. Each pin configurable for input or output Open-drain output pin for input change Great for other MCU to control simple buzzer, button, led. Size: 4x2.1cm/1.57x0.83inch Quantity: 1 Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc Expander Module