3 Working Modes: Piezo/Standard/Jumbo Full metal shell Very small and exquisite True bypass.

Working Mode: 3 (Piezo/Standard/Jumbo) 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: 17 mA Dimensions: 93.5mm (D) ? 42mm (W) ? 52mm (H) Weight:160g