Nobsound 1424 Music Spectrum Audio Spectrum Sound Level LED Level Meter Display Analyzer for Hifi (Black) The Douk audio spectrum AS1424 has 24 frequency bands, adopts 32-bit high-speed processor and professional Pure hardware agc (automatic gain control) module that can capture every detail of the music and display, available for frequency point test, has excellent visual effect and high accuracy. Color: White / Black; Size: 18.5 x 9 x 1.2cm Three kinds of classic modes: single spectrum, spectrum + peak holding, floating point, with power off memory; L (low gain) and H (high gain) 2 -level gain available; 5-level adjustable Brightness, the Brightness value with power off memory; 5-level adjustable spectrum speed they all can be adjusted by Key Two kinds of signal acquisition modes: mic (electret condenser microphone) and LIN (line input); there are two potentiometers, audio spectrum analyser display Amplitude and input adjustment potentiometers, the spectrum display Amplitude and input signal can be adjusted by them Powered by USB DC 5V, all devices with USB interface can power up the color spectrum, including computers, Cell phone chargers, mobile power, etc please do NOT use counterfeit phone chargers, unstable power supply or other power supplies which have large ripple, or it will cause damage to the handheld sound spectrum analyser With high sensitive built-in mic, can be used on car music spectrum and radio music monitoring auxiliary equipment when it is used as car audio spectrum analyser, there is No electrical wiring required, only need to connect USB DC 5V power supply and don't need to connect audio