Color: Golden - Material: Aluminium alloy - Maximum input voltage: 450mV - High-end design of the control system - Can satisfy the majority of speakers for headphones' demand - Elaborate design for servo stabilized voltage circuit - Dual signal input - With the forestage amplifying output - High-end product of preamplifier - Golden yellow aluminium material design shell - With 3.5mm earphone interface volume gain knob power switch and an indicating lamp Channel selection in close proximity to the knob - SNR: 110dB (A) - Output power: 150mW - Distortion: - Channel separation: >/= 65dB - Frequency response: 20Hz~20KHz - Output noise: - Output load impedance: 32 ohms - Input impedance: 10K ohms - With 3.5mm earphone jack - Power supply: 9V - Packing list: - 1 x Amplifier - 1 x AC 220V power adapter (US plug / 106cm) - 1 x Audio cable (95cm)