S/N Ratio: 70dB - Ultra low-noise audio operational amplifiers offer outstanding sound performance - Output: 2V max (P-P) at 10K Ohms - Dimensions: (W) 3.54'' x (H) 2.13'' X (D) 1.02''.Converts your phono signal to a line level signal - Connects to turntable - Includes power adapter: 12-V DC.Load Impedance: 10K Ohms - Reference Voltage: 1V d - DC 12-Volt adapter included - Dedicated RCA and 1/4'' output connectors.Connects to turntable output to bring phono level up to line level - THD: 0.08% @ 1kHz and 3mV - Input Sensitivity: 3mV at 50K Ohms (phono).State-of-the-art phono preamp to accommodate magnetic pickups - 9-Volt battery compartment - Frequency Response: 20Hz to 20kHz @ 2dB Connect this Ultra Compact Phono Turntable Pre-Amplifier to your turntable and converts your phono signal to a line level signal - basically connects to turntable output to bring phono level up to line level. Load Impedance: 10K Ohms - Reference Voltage: 1V d State-of-the-art phono preamp to accommodate magnetic pickups. Ultra low-noise audio operational amplifiers offer outstanding sound and performance. Comes with 9 Volt battery compartment or a DC Power Supply for your convenience. Another Great Feature of the PP555 is that it has a 9 Volt battery compartment so if you don't need extra wires and another Power outlet, which makes this device portable and easy to transport. Voltage is 110V.