1、Application: The 2.3cm / 0.9in thumb throttle speed control is suitable for electric bikes and scooters, fits most electric bikes with hall sensor controller. 2、Universal Type: Regardless of VRLA, lithium batteries, water batteries, dry batteries, regardless of various types of electric vehicles, 12V, 24V, 36V, 48V, 60V, 72V electric vehicles can be used directly, and some 84V electric vehicles can also be used. 3、Plastic Material: Using premium plastic material, the thumb throttle accelerator is anti impact, durable and reliable. 4、2.3cm Diameter: The throttle accelerator diameter is 2.3cm and it is easy to install on the 2.3cm / 0.9in diameter handlebar. 5、3 Thumb Throttle Wires: The green wire is the thumb throttle hall signal wire, the red wire is the thumb throttle positive 5V, and the black wire is the negative. Please be sure to check the wiring of the controller's function wires. You cannot simply check the color of the controller. Once it is connected incorrectly, it will cause damage to the controller or the throttle. 6、5 Core Wires: The blue wire is connected to the outlet wire of the controller switch lock, and the yellow wire is connected to the positive pole of the power supply of the controller switch inlet wire (power switch, which controls the power supply of the whole vehicle). Item Type: Electric Bike Thumb Throttle Material: Plastic Product Color: As Pictures Shown Thumb Throttle Diameter: Approx. 2.3cm / 0.9in Product Weight: Approx. 171g / 6.0oz Efficiency: ≥98% Hall Level: Linear Hall Working Voltage: Thumb Throttle DC 0.8V-4.2V Voltage Adaptation: Regardless of VRLA, lithium battery, and voltage, all can be automatically identified (12V, 24V, 36V, 48V, 60V, 72V electric vehicles can be used directly, and some 84V electric vehicles can also be used) 12V Electric Vehicles: The highest voltage is about 12.6V or a little higher, and the lowest is about 9V or a little higher. 24V Electric Vehicles: The highest voltage is about 29.4V, and the lowest is about 21V or slightly higher. 36V Electric Vehicles: The highest voltage is about 42V, and the lowest is about 29V or a little higher. 48V Electric Vehicles: The highest voltage is about 54.6V or 58.8V, and the lowest is about 39V or slightly higher. 60V Electric Vehicles: The highest voltage is about 72V, and the lowest is about 49V or a little higher. 72V Electric Vehicles: The highest voltage is about 84V or a little higher, and the lowest is about 60V. Voltmeters are already installed in higher voltage electric vehicles. 1 x Thumb Throttle 2 x Key