Board Thread:Questions and Answers/@comment-25523075-20161019063650/@comment-31123157-20161019093442

The pulse extender to the left is a five minute long pulse extender, which gives a really long redstone pulse and uses an item, a dispenser, a wooden/stone button, a repeater, and an output (e.g Door, Redstone Lamp). The middle pulse extender extends the pulse to three seconds (if using a wooden button). The right pulse extender is a five-second long pulse extender.