Converts Phono Signals: Compact ultra-low noise phono turntable preamp that converts phono signals to line-level signals with Low-noise integrated circuits and high-quality components to remove low-frequency noise to ensure clear sound quality. Designed with a grounding post to protect your turntable. Features Power Switch & 3.5MM Headphone Output: The unique power switch button design is very convenient to use. You can enjoy high-quality music with headphones through the 3.5 mm headphone output. Note: RCA line output and AUX headphone output can be output simultaneously. 3.5MM / RCA Output: BOX X1 supports MM turntable input, 3.5MM headphone output, and RCA line output for powered speakers. Note: You can connect a power amplifier through the 3.5MM or RCA output, then connect the passive speakers. MM Phono Preamplifier & DC12V Power Adapter: Output Voltage Level: 2V max (P-P) at 10K Ohms, SNR: 70dB, THD: ≤0.08% @ 1kHz and 3mV, Frequency Response: Standard RIAA. Equipped with DC12V high-quality power supply. Easy quick setup for all MM (moving magnet) cartridges, Metal Aluminum case protects the unit from vibrations and electromagnetic interference.