The Ampeg Scrambler Bass Overdrive pedal infuses your sound with authentic Ampeg grit, grind and sag. Dial in a huge range of overdrive from subtle to screaming. Add in a touch of highs, then blend in with your dry signal to create the perfect tone. It's pure analog Ampeg overdrive that's super affordable. Features Delivers classic Ampeg grit, grind and sag Separate drive and blend (wet/dry) control Treble and volume control True bypass, analog design with incredible signal-to-noise ratio Roadworthy all-metal chassis construction 9V DC supply or battery capable (not included) Specifications Signal to Noise Ratio (50 Hz @ 3e00 mV RMS): > 85 dB Maximum Gain: + 18 dB Tone Control: Treble: +17/-14 dB @ 4 kHz Impedances: Input: 1 MΩ @ NORMAL, 83 kΩ w/-15 dB PAD Output: 120Ω Power Requirements: Internal: 9 V Battery; External: 9 VDC, > =20 mA Size (H x W x D): 56 mm x 66 mm x 114 mm (2.2 in x 2.6 in x 4.5 in) Weight: 0.3 kg / 0.6 lb (approximately)