Features: 1.Various Types: This bass guitar pedal delivers various types of compression via ATTACK, COMP, SENSE, VOL, GAIN knobs, which ensures clarity and makes sound stand out during live performance. 2.ATTACK and SENSE: The ATTACK and SENSE functions of this bass compression give it a strong compression, transparent tonality and a clear articulate sound production. 3.Extra Volume: This compression guitar pedal can also be used to give extra volume and penetration when required. 4.1/4in Single Track: This compression effect pedal adopts 1/4in monophonic track jack for signal input and output. 5.Aluminium Alloy: This bass compression pedal is made of premium aluminium alloy in high strength, which is sturdy and durable, not easy to break. specification:Item Type: Bass Guitar Pedal Material: Aluminium Alloy Power Requirements: 9V DC Current Centering Negative Signal Input: 1/4in Mono Jack Socket Signal Output: 1/4in Mono Jack Socket Current Consumption: 50mA Product Size: Approx. 12.1 x 9.5 x 3.9cm / 4.8 x 3.7 x 1.5in ( Manual Measurement, Slight Error May Exist ) PackageList:1 x BassGuitar Pedal 1 x Foot Pad