Digital display shows voltage and quantity of electricity.  Universal fit for various models of motorcycle, electric vehicles(6-100V), can be automatically identified, real-time display.  18650 lithium polymer lithium battery, lead-acid batteries, electric vehicle batteries, nickel-hydrogen batteries and other types of electric equipment can be used.  Use of digital display voltage, you can directly know the battery power and monitor the remaining battery power according to your own electric vehicle battery voltage, you can also judge whether the battery is damaged by full charge battery voltage.      Battery Display Description:  The following data is the set reference value, please allow error range.  12V lead-acid voltage range: The battery voltage is greater than 11.1V, brighten 1 grid power.  The battery voltage is greater than 11.3V, brighten 2 grid power.  The battery voltage is greater than 11.6V, brighten 3 grid power.  The battery voltage is greater than 11.9V, brighten 4 grid power.  The battery voltage is greater than 12.2V, brighten 5 grid power.  The battery voltage is greater than 12.5V, brighten 6 grid power.  The battery voltage is greater than 12.9V, brighten 7 grid power.  The battery voltage is greater than 13.3V, brighten 8 grid power.  The battery voltage is greater than 11.6V, brighten 3 grid power.  36V lead-acid voltage range: (you can use 12 series lithium iron phosphate battery).  The battery voltage is greater than 33.2V, brighten 1 grid power.  The battery voltage is greater than 33.7V, brighten 2 grid power.  The battery voltage is greater than 34.2V, brighten 3 grid power.  The battery voltage is greater than 34.7V, brighten 4 grid power.  The battery voltage is greater than 35.9V, brighten 5 grid power.  The battery voltage is greater than 36.9V, brighten 6 grid power.  The battery voltage is greater than 38.1V, brighten 7 grid power.  The battery voltage is greater than 39.2V, brighten 8 grid power.  48V lead-acid voltage range: (you can use 15 series lithium iron phosphate battery).  The battery voltage is greater than 44V, bright 1 grid power.  The battery voltage is greater than 44.6V, bright 2 grid power.  The battery voltage is greater than 45.4V, bright 3 grid power.  The battery voltage is greater than 46.3V, bright 4 grid power.  The battery voltage is greater than 47.6V, bright 5 grid power.  The battery voltage is greater than 48.9V, bright 6 grid power.  The battery voltage is greater than 50.4V, bright 7 grid power.  The battery voltage is greater than 51.9V, bright 8 grid power.     Specification:  Input Voltage: 12V, 36V, 48V DC.  Work Current: 5-15A.  Work Temperature: -10~+65℃.  Voltage Display Color: Red, Blue.  Handlebar Diameter: About 48X29X21mm/1.9X1.1X0.8in.     Installation Instruction:  Red is the power of the positive line, black is the negative.  Put the display board positive and negative wire terminals to connect the two-side of measured battery positive and negative, then it will shows real-time battery power.  Fitmnet:  Universal fit for electric scooter, motorcycle and so on.     Note:  1. No English installation manual, professional installation is highly recommended.  2.