It is the successor of the Final Booster FBT-1 by combining it with the Vitalizer‚Ñ¢ buffer. The Final Booster is a full-range booster that emphasizes the sound quality by boosting it up to 20db. It will boost the volume of your pedals if placed after them or it will boost the gain if placed before overdrive/distortion pedals. Its LED not only shows operation but also starts to dimmer when the battery drops below 7 volts. It include the Vitalizer‚Ñ¢ converter which cleans your sound all throughout your signal chain by converting it from high impedance to low impedance. The Vitalizer buffer is alway son, even when the pedal is off.