This is a really useful little gadget. Ideal for travelling with, or warming up backstage before a gig.
It plugs directly into the jack socket on your bass, the plug kind of turns around to accommodate different positioning of sockets, so I guess it'll fit most basses.
Works off a 9 volt battery that I'll supply with it.
It has a really useful input for mp3 or CD players too.
In good condition, and works perfectly.
£20 posted.