Features： 1.Professional Grade Control: Dual channel synchronized control of 15 band digital equalizer, LED spectrum indication for each band, real time 15 band frequency with 99% absolute accuracy. 2.Equalizer: Precise sound production using intuitive controls through cutting edge noise gate noise reduction. An equalizer is an sound processor used to adjust the volume or gain of different frequency ranges in an sound signal to achieve a balanced and equalizing effect on the sound signal. 3.Adjusting Spectral Balance: An Equalizer adjusts the volume of different frequency ranges of an sound signal to make bass, midrange and treble more balanced across the frequency spectrum. By boosting or diminishing the volume of specific frequency ranges, sound clarity and timbre can be improved. 4.Eliminate Feedback Problems: In live sound applications, equalizers can be used to eliminate feedback problems in an sound system. By attenuating the volume of a feedback frequency range, feedback sounds can be reduced or eliminated, improving the stability and reliability of the sound system. 5.Adjusting Sound Effects: Equalizers can be used to adjust special effects in sound, such as increasing bass effects and emphasizing vocals. By adjusting the volume of different frequency ranges, various sound effects can be customized and adjusted. specification：Item Type: Music Spectrum Level Light Material: Acrylic Power Supply Voltage: DC5V 7-18V Maximum Current: 0.5A Frequency Response: 20Hz-20KHz Channel: Dual Channel EQ: 15 Bands ± 30dB Equalizer Display Area: Approx. 200 x 30mm / 7.9 x 1.2in DSP: Sample Rate: 48KHz Input Gain Adjustment Range: -6 To+42db Output Gain Adjustment Range: -52 To +12db. AGC Adjustment Rate: -3db To-27db Modulation Range: -8 To +8 Degrees. EQ Frequency Points: Logarithmic 15 Bands EQ Data Sets: 6 Presets, 10 Individual Settings Built In Silicon Microphone, Can Be Used Without Microphone. Dial Operation To Switch The Display Mode, Encoder Operation To Control The DSP Sound Equalizer Battery s: 1 x CR1220 (Not Included) PackageList： 1 x Equalizer 1 x USB Cable 1 x User Manual 1 x Sound Cable 1 x Knob 1 x Connection Cable