DC 12V power adapter and dual gain: This phono amplifier includes a DC 12V power adapter for versatile use. The PP500 features gain adjustment for input and output to ensure optimal volume playback. Low noise operation: The PP400 record player amplifier uses a low noise op amp with a maximum output of 2V (PP) at 10K ohms. For best results, place the preamp close to the source to minimize noise and interference. Sensitivity: This phono turntable preamp converts sound signals to line level signals with electromagnetic pickup input sensitivity. Independent knob control allows for convenient operation. Connectivity: The phonograph amplifier connects any turntable to modern sound equipment without requiring a dedicated phono input. It can be linked to speakers, computers, laptops, and more. Plug and play: This mini preamp features stereo RCA inputs and outputs. Simply connect the turntable to the RCA inputs and ground, then link the amplifier receiver to the RCA output for easy setup.