Does what it says on the tin, used it to replace a faulty pre-amp on an old Vintage bass, worked as expected - quite easy to fit if you are handy with a soldering iron, all th eparst you need are here. Only small annoyance was the centre of the balance pot was not as easy to find, maybe could have been designed with a "click" when it is at dead centre. Output level is nice and strong and the frequencys of the one controls are well chosen, the treble adds a nice edge without dissolving into noise, bass pot too adds a nice boost to the bottom end. Suited my Vintage V1004 very well, but obviously could be too much for some guitars