A lightweight and very small analog stage mixer supporting the Bluetooth wireless communication standard, equipped with a USB port and MP3 file support and Phantom +48 V power supply. The device supports 4 channels. It has 2 combo XLR/jack signal inputs, which, thanks to a special switch, can operate in mono mode or as a single stereo channel, and a stereo RCA (cinch) connector for channels 3 and 4. The user can control the volume level of each channel, use a 2-band equalizer for treble and bass, and boost the signal on inputs 1 and 2. In addition, the audio mixer has a built-in delay effect, the frequency and level of which can be easily controlled on a selected channel. The output signal can be sent to loudspeakers or monitored on headphones. The strongest feature of this audio mixer is the USB port with built-in MP3 player, allowing us to connect a laptop, external memory cards or other devices sending audio signals to the console.