Douk Audio Vu56C 56-Bit Level Meter With Audio Display, Led Music Spectrum, And With input level (gain) adjustment, very easy to control most input signals and achieve better beating effects. And 5 kinds of display effects are specially designed: 1. Main beam 2. Main beam + peak point drop 3. Left and right channel beams mirroring-display 4. Left and right channel beams mirroring-display + peak point drop 5. Spring beam (Not supporting setting items) All setting items (with 16-level speed adjustments) can be set independently, and with sample effects display that can see in real time. All display items includes: 1. The descent speed of main beam 2. The descent speed of peak point 3. The stay time of peak point Parameters: Number of bit: 56 bit / per channel Optional display color: 32 bit green+16 bit orange + 8 bit red Power interface: Micro-USB Working voltage: DC 5V /100mA Power on/off function: support Power off memory function: support Input level (GAIN) adjustment: support Input voltage: 0 ~ 3Vrms Audio input: stereo L/R RCA Audio output: stereo L/R RCA Dimensions(L*W*H): 150*120*40mm / 5.91*4.72*1.57in Net weight: 225g / 0.50lb Package weight: 400g / 0.88lb Notice: 1. The spring beam effects doesn't support setting item values. 2. Because of high resolution and adopting MCU process signals, in some condition, there will be 1-3 bit error between left and right channels even input the same signal on both channels, this is normal. Packing List: 1*Finished LED Music Spectrum 1*Micro-USB Cable 1 Set*Stand 1 Set*Isolation Stand Feet 1*Manual Original music spectrum from Douk Audio. Adopting MCU to process the audio signal, 56 bit in per channel, 112 bit stereo display. Ultra-high resolution, acheiving to see the music level status in real time, every slight change of sound can be shown visually, dynamically decorating your listening enjoyment. With input level (gain) adjustment, very easy to control most input signals and achieve better beating effects. And 5 kinds of display effects are specially designed. All setting items (with 16-level speed adjustments) can be set independently, and with sample effects display that can see in real time. 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. With standard stereo L/R RCA input and output, can compatible with most common audio device such as mobile phone, computer, CD players, preamp, power amplifier or studio mixers and so on, suitable for a variety of scenarios.