Single band parametic equalizer
http://www.bossus.com/go/boss_classics/sp1.html
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Almost mint. It works fine with 9V power adapter or 9V battery.It made in Japan.Use of a PSA adapter is recommended.The SP-1 is part of the 40th anniversary set that faithfully reproduces the first generation of BOSS compact pedals, the OD-1, PH-1, and SP-1.It is hand-wired and assembled on a domestic production line in Japan with carefully selected electronic components, just as they were when the original models were first released.It is one of a limited series of 1,500 sets sold worldwide.

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