Features:Adopts MCU processed onal signals to better realize exponential gain-drive and provide automatic adjustment of ultra-wide input signals, greatly improve the display effect compared with the common VU meter in the market. Reasonable and simple circuit layout, power supply only supplies power to the driver board and the VU meter, without o input/output circuit, the sound quality will not be interfered, but only adds dynamic visual enjoyment. With automatic gain-adjustment function, very easy to control most of the input signals to achieve better beating effect. The backlightfunction can be turned on or off, convenient to use, bright and warm lights can decorate your desktops or live broadcast room. With standard stereo-L/R RCA-input and output, most common onal devices such as mobile phones, computers, CD-players, preamplifiers, power amplifiers or studio mixers are compatible, suitable for wide range of scenations. Specifications:Material: PlasticModel: VU1o-input: Stereo-RCA/Mic-pickupo-output: Stereo-RCABrightness Adjustment: 4 level and support power-off memorySensitivity Adjustment: 6 level and support power-off memoryWorking-voltage: DC9-12V 200mABacklight-Filament Voltages: DC-AC6-12VBacklight-Filament Current: 500AVU Surfaces Diameter: 35mmDimension: about 150x120x40mm/5.91x4.72x1.57in Note:Default setting, when GAIN-rotated to 50%-position, the 0dB position input-voltage of VU meter is 0.775Vrms.The VU meter driven-by exponential gain-algorithm, when the input volume is small, the pointers swing large, while the volume gradually increases, the pointers swing small. Package includes:1 Piece VU Meter