It can be easily adapted to any amplifier or preamplifier in a car or at home. It scores over conventional VU METERS in many ways as it gives a more accurate reading, it has adjustable sensitivity and last but not least it improves aesthetically the amplifier front panel! It can be used with all the amplifiers and preamplifiers of SMART KIT. A suitable power supply is SMART KIT 1061. Operating voltage: 12-18 VDC. Max. current 100 mA. PCB-Size: 38mm x 105 mm