1. This mixer features input gain and high and low adjustments, with a built-in 48V phantom power supply suitable for the direct use of condenser microphones, high-definition headset output port, MP3 player, Bluetooth receiver, and a connected PC sound card. 2. The mixer is compact and lightweight, allowing for direct connection to the PC's USB port for power without the need for an external power supply. It can be operated by connecting to the computer via USB, eliminating the hassle of using an external adapter. Item type: Sound Mixing Console Power: mobile or USB Channel: 4 Bluetooth Connected: Yes Total Harmonic Distortion: 0.1% Frequency Response: 20Hz-20KHz/0.5dB S Ratio: 80dB MAX Outputs: 4V/MAX MIC Impedance: 2.4 Mono Impedance: 11 Stereo Impedance: 100 Parametric EQ High: 12KHz/15dB Parametric EQ Low: 80Hz/15dB Size: 15x18x5.5cm Material: ABS Colour: black Package Contents: 1 * audio mixer 1 * USB wiring 1 * Lotus line Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the actual product. The measurement allowed error is +/- 1-3cm.