Professional 4-channel Bluetooth/USB/Stereo RCA mixer Professional 4-channel CONSOLE Effects processor Aux Paths Plus and Bluetooth. Connect to your PC or laptop directly with USB, no software or setup required. Plug & Play The package includes: 1 mixer, 1 power cord. Built-in 48V phantom power for condenser microphones. 3.5mm AUX input for headphones Power supply: 5V Size: 18   Technical features Total Harmonic Distortion: ≤ 0.1% Frequency Response: 20Hz ~ 20KHz/±0.5dB S/N Ratio: ≥-80dB MAX Outputs: 4V/MAX MICROPHONE Impedance: 2.4KΩ Mono Impedance: 11KΩ Stereo Impedance: 100KΩ Treble EQ: 12KHz ± 15dB Bass EQ: 80Hz/±15dB