With MM signal input and 3.5mm AUX input(with priority), can be used as a MM phono preamp and a tube preamp, compatible with many audio devices such as MM record player, phone,TV, MP3 players, CD players, , computers etc. to satisfy different demands. Reasonable curcuit layout and concise wiring to HiFi clear sound with low noise, adopting 2PCS 6J2 vacuum tubes(can be replaced by 6K4 or 6J1 or 6J4 or GE5654 or 6AK5 or 6x1n)to make sound warm, dynamic and sweet, bringing extremely high-quality listening experience. With gain adjustment switch(OFF-39dB-42dB-45dB), convenient to match better with different audio signals, the front panel are machined with wire drawing and frosted technology, looks more fashionable and distinctive. Mini size with exquisite appearance, aluminum alloy chassis with better shielding performance and gold-plated terminals with lossless transmission, perfectly suitable for MM record players and other audio sources. Input mode: and3.5mm AUX Output mode: Active speaker Frequency response standard: RIAA Total harmonic distortion: 0.1percent Signal to Noise Ratio: 98dB DC input range: 12V Input voltage range: AC 110V - 240V Output voltage level: 600 Mv 3mV 1kHz Power 1.5A Power supply: 12V Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. voltage: AC110V Colour:As shown Material:Zinc alloy Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 x Mini HiFi MM Phono 1 x 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.