Features Dual 40 LED music spectrum, adopting high-precision audio process chip to transfer the audio signal to LED display, each channel with 20 green+10 yellow+10 red LEDs, acheiving to see the music level status in real time, every slight change of sound can be shown visually. Two display modes are designed for much fun, dot display or bar display can be switched freely. And each channel with input level (gain) adjustment button (-57dB ~0dB), just rotate it to adjust different input signals and achieve better display effects. With standard stereo L/R RCA and optional microphone input, compatible with most common or professional audio devices, suitable for recording studio, broadcast station, TV station, professional audio cabinet, home, car use, make the music visible. Reasonable and concise circuit layout, the power supply is only provide power to the display main board, not pass through audio input and output circuit, the sound quality will not be interfered but only adding the dynamic visual enjoyment. Powerful design with cool appearance, pure black steel case is made of 2mm steel and processed by multiple treatments, looks attractive and amazing, can both decorate your listening enjoyment and use environment. Sound Pressure Level Accuracy Parameters Audio signal input: stereo L/R RCA / Microphone (optional) Audio output: stereo L/R RCA Number of LEDs in each channel: 20 green+10 yellow+10 red Display mode: dot / bar (switchable) Display range: -57dB ~ 0dB Working voltage: DC 9-12V (>400mA) Power Consumption: 5W Input level adjustment: support Power on/off function: support Material of chassis: 2.0mm steel Dimensions(W*D*H): 482*52*44mm / 18.98*2.05*1.73in Net weight: 1.1kg / 2.43lb Package weight: 1.4kg / 3.09lb Packing List 1*LED Sound Level Meter 1*DC 12V Power Adapter