NCD I2C Cables make it easy to link devices together. Available in 4 sizes, based on your needs. Please note: The 3″ I2C cable is included with all Mini Modules. The 6″ Cable length is included with all other NCD devices. We also have 12″ and 20″ cables available, but longer cables are not compatible with all NCD IoT devices. As a general rule, the I2C cable length should be as short as possible.