Maximum output level: 3.3V Frequency response: 10Hz-20kHz/+-1dB +N(harmonic distortion + noise): 0.01% Magnification (L,R,C,SL,) 2.4x Magnification (SW): 4x SW center frequency: 65HZ Input channels: Bluetooth, USB, fiber, coaxial, AUX Lossless format support: MP1, MP2, MP3, WMA, WAV, APE, FLAC Support Capacity: Up to 128GB U disk TF card sampling rate: 44.1~48khz24Bt Output channel: 5.1 channels Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Voltage:AC100-240V Color: Black Material: Metal Package Contents: 1 * Headphone Amplifier 1 * power adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.