Easy to determine the Remaining Amount of Electricity: By turning the real-time voltage value can accurately determine the amount of the remaining amount of electricity. To avoid traveling on the way without electricity and accurate judgment of the lithium battery is damaged. Easy to Use: By turning the real-time voltage value can accurately determine the judge the quality of lithium battery. Automatically: Automatic to identification electric vehicles' voltage under 100V, universal used and real-time display. The Bicycle Scooter Twist Throttle Grips is suitable for DYU electric bikes.