Bought this as replacement for my original Cool Tube preamp that broke. This is a cheaper preamp with less features and no tube. Has 9v battery with easy access, built in tuner and okay EQ. The sound is even and clear. Easy to install, just click in the original frame that’s already in the guitar (not included). Only downside I can think of is that the tuner has to be pressed two times to mute when plugged in.