MM/ phono preamp: converts phono signal to line level signal, low-noise integrated circuits and high-quality components are designed to clear sound; with a MM/ switch on the bottom, easy to select to match different kinds of turntables. LINE and 3.5mm headphone outputs: with stereo output to connect amplifiers or active speakers, greatly improve their sound quality; also add a 3.5mm headphone jack to drive all 16-200 headphones, convenient to enjoy music from record players alone or at night. HIFI sound and tone control: with treble and bass control within -5dB to +5dB range, easy to adjust different sound styles to personal perference.With built-in power isolation circuit, no common ground noise will be generated even sharing the same power with audio players. Mini size and easy to use: compact design, all-aluminum shell and gold-plated PCB and terminals can maximally isolate external interference signals to lossless transmission; USB 5V input voltage, also can be powered by computer or power bank, convenient to use anywhere in your house. Different batches may have different appearance, which does not affect use. Audio input: MM/ phono Audio output: Stereo / 3.5mm Headphone Jack Input level: MM: 0.005V RMS : 0.0005V RMS Frequency response: conforms to RIAA characteristics(0.5dB) Treble / bass range: 5dB Headphone output power: 250mW @32 100mW @64 60mW @128 Headphone impedance range: 16-200 : 0.1% Output level: 0.6V RMS S ratio: 80dB(Phono) Working voltage: DC 5V(0.6A) Warm Tips: 1. 3.5mm headphone output with priority, please make sure the headphone cable has been pulled out if want to use stereo output. 2. Without a DC5V power adapter, please prepare it by yourself. Colour:Black Material:Metal Package Contents: 1 x MM/ Preamp 1 x USB Cable 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.