FEATURES This system is a low-noise type octave that can produce notes one octave lower and more octaves higher than a direct clarinet sound. Moreover, this processing signal perfectly follows the original direct sound of Clarinet and creates a realistic bass sound. Especially in MAKAM position there is a pure and perfect polyphonic, Harmonic sound along with lower octave. Comes with 1/4 jack (in/out), 9volt Dc plug jack and Battery-compartment. (6F22) Battery (9 Volt).