Features:LED Digital Display: Real-time digital voltage display, intuitive, convenient, practicalUniversal design, it can be installed on various electric bikes with voltage varying from 0 to 99V. Also having no limitation to the battery types.You can early judges whether the battery is damageds and do the maintenance-job or not according to the voltage display.Compatible with most electric bike with 22.5 mm handlebar.Stable performance: The wires and interfaces are rugged, which ensures fewer failures when used for a long time. The E-bike speed control throttle can control the speed stably and sensitively.No matter Lead-acid batteries, water batteries, dry batteriesNotice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurement Description:Material: PlasticColor: Black4 Wires: Hall Signal(Green), Red(+5V), Black(Negative Pole), Yellow(Bike Positive Pole)Applicable Handlebar Diameter: Approx. 22.5 mm / 0.88 inchCable Length: Approx. 2m / 6.5ft