Product Features i Tube Vacuum Tube Amplifier with integrated Dock for Apple iPod Gorgeous black high-gloss finish Valve processing gives warm, rich, audio characteristics Available with speakers Product Specification Power Output: 25 Wx 2 Frequency Response: 20 Hz 20 K Hz (1.5 Db) Harmonic Distortion: 0.5% Signal-To-Noise Ratio: 86 Db Input Impedance: 100K Output Impedance: 4 ohms 8 ohms Valve Type: 2x 6N1 (ECC85) 1x 6E2 (EM87) Power Supply: AC100~120V/50~60 Hz, AC220~240V/50~60 Hz Dimensions: (Amp) 360x 148x 172mm (Wx Hx D) Weight (Amp) 3.97 K Gs