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
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28-955 - Double Sided Foam Tape
Thousands of uses Fasten accessories to car dash, etc. 3/4" x 61/2' roll
80-6875 - VHS Head Cleaner
VCR Head Cleaner safely and effectively cleans tape heads and entire tape path Non-abrasive
Exclusive cleaning material prevents debris from re-depositing on heads
MCM Cat 57, Page 663
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Quick shipping, quality products and reasonable prices. I've redone most of my home with MCM products. Very pleased.