Features: SA1000 Audiophile Tube Preamp HIFI Amplifier auditory, provides highly quality auditory output, allowing users to enjoy quality sound. 4 into 2 out lossless auditory switching amplifier, to achieve flexible and diversed auditory input and output connection. Adopting highly tube technology, the output sound quality is warm and delicate, bringing immersive music experience. Beautifully and simple appearance, easy to operate, suitable for audiophiles and professional users. For audiophiles, HIFI auditory enthusiasts, professional music recording engineers, DJs and other user groups with high requirements for sound quality. Specifications: Model: SA1000 Tube Preamplifier Size:about 145x85x85mm/5.71x3.35x3.35in Standard: Optional Component：Metal Support 4 Inputs 2 Outputs Frequency 20hk-20Khz Voltages：12V Package Includes: 1Set SA1000 Tube Preamplifier note: Due to problem of lighting,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement