Board Thread:Questions and Answers/@comment-71.90.234.203-20130205230416/@comment-10703376-20130711041606

When given EU/MJ, it will break the block it's facing and output the block through the back side. Not as useful as RedPower Block Breaker, because they don't use EU/MJ. If you're looking for something that doesn't need a redstone pulse (Like RP Block Breaker), this is what you're looking for.