The AC Booster is one of the most versatile boost pedals on the market.  It can work as a boost all the way up to a distortion pedal depending on how you use the controls.  As Xotic Effects likes to say it'll "make you rethink the definition of 'Booster'."

Features * Creates a warm and pleasant sound by using the finest quality parts available. * The super wide range gain control allows for enough gain for it to work as a distorion pedal when turned all the way up.     * Equipped with not only boost Gain but also Treble and Bass controls that allow you to adjust your sound anyway you like.     * True bypass for eliminating any signal interference when switched off.     * Can be used with AC adaptor (optional - not included) or 9V Battery.

Specs * Dimensions (W/D/H): 4.39" x 2.38" x 1.98" (112mm X 60mm X 50mm) * Weight: 0.6 lbs. (280g) * True Bypass Switching * Power Consumption: 9VDC/6mA * Battery Type: 9VDC (006P) x 1 * AC Adapter (Optional): 9VDC, Negative Tips (Regulated recommended) * Input Impedance: 500k ohm (min) * Output Impedance: 10k ohm