1. The mixer is equipped with input gain and high and low bass adjustment. The built-in 48V phantom power supply is suitable for direct power supply of condenser microphones. It features a high-definition headset output port, MP3 player, Bluetooth receiver, and can be connected to a PC sound card. 2. The mixer is small and lightweight, and can be directly connected to the USB port of a PC for power supply. No additional power supply is required. It can be powered by connecting to a computer via USB, eliminating the need for an external adapter. Item type: Sound Mixing Console Power: Mobile power or USB AC/DC Channel: 4 Bluetooth Connection: Yes Total Harmonic Distortion: 0.1% Frequency Response: 20Hz-20kHz ±0.5dB S/N Ratio: 80dB MAX Outputs: 4V/MAX MIC Impedance: 2.4kΩ Mono Impedance: 11kΩ Stereo Impedance: 100kΩ Parametric EQ High: 12kHz ±15dB Parametric EQ Low: 80Hz ±15dB Size: 15 x 18 x 5.5 cm Material: ABS Color: Black Package Contents: 1 x Audio Mixer 1 x USB Cable 1 x RCA Cable Only the above package content is included; other products are not included. Note: Lighting and different displays may cause slight color differences between the item in the picture and the actual item. Measurement allows an error of +/- 1-3 cm.