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.
22-15920 - Pliers Storage Rack
Pliers storage rack makes a handy storage solution for any work bench or tool chest. Keeps up to 32 pairs of pliers organized but ready for work.
28-955 - Double Sided Foam Tape
Thousands of uses Fasten accessories to car dash, etc. 3/4" x 61/2' roll
35-5155 - 10MM Headphones White High Performance Earbud
High Performance Earbud Headphones White
Lightweight, stylish, high performance earbuds give crystal clear sound as well as a comfortable fit. Ideal for use with CD, MP3, MP4 and any other small portable audio players.
MCM Electronics has always provided me with quality parts and service for many years. Never a bad experience.