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RAINBOW by RAZOR-DIGITAL SOUND LEVEL METERRainbow by Razor (VD-400) adopts vacuum tube as an audio signal controller. It makes output sound signals from car audio amplifier the smoother and gentler classical feelings. Features: 1. Connect to car battery directly. Easy Installation. 2. The analogic display visualizes the stereo volume / pressure of the 2 channels (right + left) from-20dB to 3dB. 3. Reflective LED display with choices of 7 colors backlight + 1 blinking (Red, Green, Blue, Yellow, Orange, Purple, and White-7 colors cycle) . 4. Classic Vacuum Tube audio signal treatment technology. (Note: With no amplifier, vacuum tube will not perform sound control feature. It is highly recommended using VD-400 with amplifier to get the best sound quality) 5. The buttons adjust the intensity of colouration and sensibility of instrument / bouncing of VU meter (With amplifier, a button is the volume control knob. Without amplifier, the button becomes a meter bouncing control knob) . 6. Stan