This is a breakout board for the PCA9306 dual bidirectional voltage-level translator. Because different parts sometimes use different voltage levels to communicate, voltage level translators can be the key to making different parts play nice. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10403 Datasheet: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/BreakoutBoards/PCA9306.pdf