Power boost.

The ad reads, “It’s as if you had 20 sets of pick-ups, all in one guitar.” Quite the claim for a $21.95 boost pedal! The Electro-Harmonix LBP-1 plugged directly into the amp, while the LBP-2 was “a heavy duty convenient floor model.” As with most vintage E-H pedals, these now sell for more than double their original price. From Guitar Player, January 1977.