Wiring: red cable for positive, black cable for, blue cable for power switch for voltage measurement, make your vehicle work at normal voltage, prolong your vehicle ' s service life with necessary fittings, hold the meter in place, fix tightly and not easy to, great for checking voltage size, easy to carry, won ' for t obstruct riding, guaran your safe riding LED panel digital display, reading in seconds, more intuitive, quick and, Manufacturer: Beimus