The port extender board gives you an additional 16 GPIO pins to use on your Raspberry Pi, which can be used as digital input or output.
You can additional information on the Quick2Wire website
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28-17734 - Raspberry Pi Interface Board
The Quick2Wire Interface Board gives you easy access to all the features on your Raspberry Pi’s expansion header with added protection of not creating a dead Pi
28-17736 - I2C PCF8591 Analog Interface Board
The Quick2Wire I2C analog extyender board has four 8-bit analog inputs and one 8-bit analog output.
28-17737 - I2C Raspberry Pi Port Expander Combination Kit
This combo kit includes a Quick2Wire Interface Board and Port Extender to allow you to use your Raspberry Pi to its fullest extent.
MCM Cat 57, Page 663
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