1It can do real-time digital voltage display, intuitive and convenient, and you are able to accurately determine the remaining power. 2Universal design, it can be installed on various electric bikes with voltage varying from 12 to 99V. Also having no limitation to the battery types. 3You can early judge whether the battery is damaged and do the maintenance job or not according to the voltage display. 4Compatible with most electric bike with 22.5 mm handlebar. 5The wires and interfaces are durable, and ensure low malfunction during the long time use. Easy to install and use. Features: It can do real-time digital voltage display, intuitive and convenient, and you are able to accurately determine the remaining power. Universal design, it can be installed on various electric bikes with voltage varying from 12 to 99V. Also having no limitation to the battery types. You can early judge whether the battery is damaged and do the maintenance job or not according to the voltage display. Compatible with most electric bike with 22.5 mm handlebar. The wires and interfaces are durable, and ensure low malfunction during the long time use. Easy to install and use. Specification: Condition: 100% Brand New Material: Plastic Color: Black 4 Wires: Hall Signal(Green), Red(+5V), Black(Negative Pole), Yellow(Bike Positive Pole) Applicable Handlebar Diameter: Approx. 22.5 mm / 0.88 inch Cable Length: Approx. 2m / 6.5ft Weight: Approx. 98g Packing List: 1 x Thumb Throttle Note: It usually is installed on right side.