1. [DSP Effect Function]: The professional 4-channel mixer features a built-in 16 DSP delay sound effect processor to enhance your audio and music experience. 2. [Record to PC USB Disk]: The mixer has a built-in sound card and interface. The DJ controller can record to a PC, U-disk, or mobile phone. It includes built-in recording control with output via USB port. 3. [Wireless Bluetooth Connection]: This mixer allows users to wirelessly stream music from tablets, phones, and computers for music mixing. It has built-in controls for play, pause, track skipping, and modes. 4. [USB MP3 Flash Drive Compatibility]: Can connect via external USB, PC, or laptop, flash drive, or Bluetooth devices to mix and record the mixer's audio output to other devices. 5. [Stereo Input]: 2 mono inputs support XLR and unbalanced 1/4-inch plug with 48V phantom power. 1 stereo and USB or wireless input with 6.3mm XLR, RCA jacks for connecting various devices like dynamic microphones, condenser microphones, wireless microphone receivers, guitars, and other instruments.