I bought it for my brother bass guitar,,he got ibanez sr800 japanese vintage from 91! and bass just got that modern sound now that i have been loking for,when i first connected it it was distorted a bit,then i fixed it with trim pot for every pickup.Now it works Flawlesly! Battery is very efficient,and doesnt make some nasty noisy sound like it used to do without upgrade..go for it,,cheap but worth it!