In the words of JHS Pedals:

Though its a fairly nondescript-looking piece of gear, our Little Black Buffer may be the most powerful tone-shaping tool that you put on your pedalboard. By adding it to your signal path, youll restore all the high-end detail, output level, and tonal character that involved pedal chains and long cable runs steal away. And because the Little Black Buffer is an on-all-the-time sort of thing, you can save precious real estate by mounting it on the underside of your pedalboard. Give the Little Black Buffer a try. Youll wonder how you went so long without one.