The BB Preamp is a fairly in depth boost pedal.  It's widely used as a clean boost, but also has some compression qualities and can also be used as very nice and transparent overdrive.

Features * Offers a wide variety of sounds. Capable of a 30dB+ clean boost with an adjustable ±15dB two band active EQ which adds a wide range of harmonic content to your ideal sound. * Utilizes a pre-gain stage which allows the pedal to go from a very pristine clean to a very smooth, compressed, overdriven sound. * True bypass for eliminating any signal interference when switched off. * Can be used with AC adaptor (optional) 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/6mABattery Type: 9VDC (006P) x 1 * AC Adapter (Optional): 9VDC, Negative Tips (Regulated recommended) * Input Impedance: 500k ohm (min) * Output Impedance: 10k ohm