Features 1、By turning the real-time voltage value can accurately determine the amount of remaining power, convenient for customers to drive. 2、The real-time voltage value can accurately judge whether the lithium battery is damaged. 3、The quality of lithium battery can be judged by the value of turning voltage to facilitate the factory to purchase qualified lithium battery. 4、No matter Lead-acid batteries, lithium batteries, water batteries, dry batteries. 5、All kinds of electric vehicle (12V to 99V) can be automatically identified and displayed in real time. 6、Through the voltage number to determine the fault of electric vehicle, twice the result with half the effort. Condition: 100% Brand New Material: plastic Color: as picture shown Efficiency: 98% or higher Hall grade: linear hall high quality rubber imported LED digital display lamp Quantity: 1 pcs Specification: electric vehicle general accessories Terminal length: 2m by default Green is for throttle hall signal, red wire is for throttle +5V, black is negative wire; please connect according to controller function wire, U can not just match same color wire, if wrong connected that will damage your controller and throttle. 5 wires: blue wire connect with controller power lock output wire, yellow wire connected with controller electric switch input wire power positive, 6 wires ; yellow connected with power positive, blue wire and white is is function wire(can work as reverse switch, horn switch, cruise switch, power lock and so on) 7 wires: yellow connected with power positive, blue is share wire, middle gear for 3 gears , white is high gear, brown is low gear. The above is common wiring way, if need made to order please connect with salesperson. Battery common sense: Operation Instruction: 2, by turning the real-time voltage value can accurately determine whether the lithium battery damage, convenient after sale! 3, by turning the voltage value can judge the quality of lithium battery, convenient for the factory to purchase qualified lithium battery! 4, automatic identification voltage under 100V electric vehicles, can be general, convenient for factory procurement, save the cost of capital and management costs!5. There are only 4 wires for ordinary electric display, which is convenient for workers to install and save time. Note: Non-professional installation please pay attention to the line sequence, do not connect the wrong line, otherwise it is easy to cause hall and LED tube burn. Basic parameters: according to different battery materials, old and new, different batch, the number of voltage v will be different, please test a few times, you can get your electric vehicle battery parameters. For 48v electric bike, maximum voltage is about 54.6v, /58.8v, mini is about 40v or higher, For other electric bike with higher voltage there should be a voltmeter installed. Installation method: 3 wires, red for positive, black for negative, green for signal, and yellow for positive. How to maintain the lithium battery: Package List 1 x E-Bike Voltage Display