Carl Martin Ottawa, Effects pedal for electric guitar and bass, Auto Wah / Optical Envelope Filter, The velocity determines the sound and the ""position"" of the wah, Responds very dynamically to the playing style, Controls: Attack (Sensitivity), Tone (High-Cut), Q (Bandwidth), Level, Switch: HP High Pass/BP Band Pass/LP Low Pass (filter selection), LED: Effect On, Footswitch: Effect bypass, Input and output: 6.3 mm jack, Mains adapter connection: Hollow plug socket 5.5 x 2.1 mm, negative pole inside, Power supply with a 9 V DC mains adapter (not included in delivery, suitable power supply unit: Art. #409939#), Dimensions (W x D x H): 60 x 115 x 50 mm, Weight: 340 g@+@+*Note:* Battery operation is not supported