Smart direct input box with ultra low distortion,it quietly transfers the sound of guitar or bass directly to the audio system, Balanced/unbalanced output,gain switch,cabinet simulator and ground lift function included. Full metal shell, Very small and exquisite. Input: 1/4" monaural jack (impedance: 1M Ohms ), Output: 1/4" monaural jack (impedance: 1k Ohms). Power Requirements: AC adapter 9V DC (center minus plug), Current Draw: 12 mA. Dimensions: 93.5mm (D) Ã- 42mm (W) Ã- 52mm (H), Weight:140g.