Features: LED Digital Display: Real-time digital voltage display, intuitive, convenient, practical Universal 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 batteries Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Plastic Color: Black 4 Wires: Hall SignalGreen, Red5V, BlackNegative Pole, YellowBike Positive Pole Applicable Handlebar Diameter: Approx. 22.5 mm / 0.88 inch Cable Length: Approx. 2m / 6.5ft Package List: 1x 0-99V Thumb Throttle