STEREO 4-CHANNEL BLUETOOTH MIXER WITH MICROPHONE Function: 1. Easy to use: With simple operation, children can easily learn to use it, so it is suitable for small performances, home karaoke, conference control and teacher speeches. 2. U or MP3 Disk Playback: It is compatible with U disk or MP3 player and has the function of selecting songs and switching. Besides, you can connect the device to play music with Bluetooth configuration. 3. 16 reverbs: The built-in DSP digital effector extends the surround sound effect with its exceptional realism and naturalness. 4. Dual L-band equalizer: With dual L-band equalizer, the overall output height of the song can be adjusted in sections, so that voice and music can be integrated more harmoniously and smoothly. 5. Wireless chip: built-in wireless chip, the farthest reception distance is 50M, the best usage distance is about 30M, mixer for two microphones. And it has intelligent automatic frequency search and frequency matching function. Specification: Item Type: Small Mixer stereo Material: metal Gross weight: 1495 g/52,7 oz Maximum Input Level: 22dBu Microphone Input, 20dBu Line Input, Maximum output level: 22dBu; Main channel level display: 2 LED diodes from signal to peak; Input channel level: peak display 1 LED; Frequency Response Range: 20Hz to 22KHz ±1dB; Common signal attenuation factor (MIC 1 kHz): >75dB; Total loss of harmonic block: <0,05% (input channel to output); Separation (at 1 kHz: channel mute): >80dB; Noise Ratio, (rms 22Hz to 22KHz): Equivalent signal-to-noise ratio -122dBu, residual output noise <-88dBu; Monophonic input channel equalizer stereo: treble, broom, /-15dB, 12 kHz; Bas, broom, /-15dB, 80Hz; Maximum input power: DC 5C/1A 5 watts List of packages: 1 x Mixer 2 x Microphone (Battery Free Delivery) 1 x USB charging cable 1 x Manual Mode selector switch: when connected to the computer's USB interface for power supply,this mode switch jumps, the MP3 player goes into USB sound card mode,and when pressed, it enters U disk playback mode or Bluetooth operation mode;when using a portable power supply or adapter for power supply,Pressing this mode switch causes the MP3 player to switch to U disk playback mode or Bluetooth mode.