Package Included  

• 1 x CD74HC4067 16-Channel Analog Multiplexer Breakout

Description:  

• This chip is like a rotary switch - it internally routes the common pin (COM in the schematic, SIG on the board)to one of 16 channel pins (CHANxx).
• It works with both digital and analog signals (the voltage can't be higher than VCC), and the connections function in either direction.
• To control it, connect 4 digital outputs to the chip's address select pins (S0-S3), and send it the binary address of the channel you want
• This allows you to connect up to 16 sensors to your system using only 5 pins!
• Since the mux/demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices.
• For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller. 

Reference

- http://bit.ly/CD74HC4067-Datasheet
- http://blog.codebender.cc/2014/01/30/mux74hc4067/