Features: brand new and high quality This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. 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 digtal and analog signals(the voltage can'for t be higher than VCC),and the connections function in either direction. To control it,connect 4 digtal 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 5pins. Specifications: Material:PCB Net Weight:3g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Analog Multiplexer