Pyle model: pad15mxu3-ch recording USB mixer audio interface3-channel USB Audio/sound mixer recording interface with built-in rechargeable battery Features: flexible connectivity for a variety of external devicesultra-low noise design with high head room integrated sound card for computer recording support USB interface: connect to Mac/ PC built-in rechargeable battery smooth Rotary-Style faders for mic/USB/line/master controls extremely musical 2-band EQ & pan, on each channel combo microphone jack connector – XLR and 3.5Mmrca (L/R) stereo input and output Connector RCA (L/R) Input connectors voice echo effect/delay feature audio signal clip LED indicator lights input selection/ control buttons independent Channel + master volume controls independent Channel balance/high + low frequency adjustment used for beginner & professional sound applications Universal digital audio file compatibility in the box: mixer interface USB cable wall adapter technical specs: Phantom power: +18Vmic sensitivity: 1.3mV/1.7Kω(gain max)ch.1 sensitivity: 5mV/12kω(gain max)ch. 2/3 Sensitivity: 260mV/16kω2-tk: 300mV/22kωoutput level: 5.8V Max (main; monitor)frequency range: 20 -21000 hot.H.D.: ≤0.05%S/N ratio: 81Dbeq range: bass 15dB/80Hz, high 15dB/12Khzheadphone impedance: ≥16ωusb interface: SB 2.0, Windows 98SE+, Macc OS 9.Rechargeable battery: 3.7V Lithium Ion, 600Mahpower supply: USB, 5V/500Ma (type-b)dimensions (L x W x H): 3.97’’ x 5.31’’ x 1.77’’ - inches The Pyle channel USB Audio/sound mixer recording interface is like a portable recording studio. It's perfect for computer-based audio editing while adding fine-tune adjustments to your sound. The mono input channel allows you to connect a (phantom-powered) microphone. At the XLR jack, a Phantom power of +18V is always present. The stereo input channel allows you to connect an audio source with line signal level. In addition, the mixer is provided with connections for a recorder and Headphones. The mixed signal is sent to the output via RCA jacks and the USB port. It is also possible to use the USB port as an input to transfer audio data from the computer to the mixer. When connecting the mixer to a computer, power is supplied via the USB connection.