Features : 3 Working Modes: Lo Boost / Boost Off / Hi Boost. Lo Boost mode : Boost a narrow band of high frequencies a little bit. Boost Off mode : No boost is engaged. Hi Boost mode : A higher amount of boost is engaged. Full metal shell. Very small and exquisite. True bypass. Specifications : Effects Modes: 3 (Lo Boost, Boost Off, Hi Boost). Input: 1/4" monaural jack (impedance: 1M ). Output: 1/4" monaural jack (impedance: 470 Ohms). Power Requirements: AC adapter 9V DC (center minus plug). Current Draw: 20 mA. Dimensions: 93.5mm (D) × 42mm (W) × 52mm (H). Weight: 160g.