Feature: 1. Stable and Responsive: Provides stable and responsive speed control, works well on the left side of the handlebar. 2. Durable: The wire and interface are durable and have good contact, ensuring a low failure rate for long term use. 3. Applicable: Electric scooter accelerator fits most electric bike or scooter handlebars on the market. 4. Linear Way: Red positive, green signal line, black negative, Thumb Accelerator with accessories, easy to install. 5. ABS Material: High quality ABS refined, flame retardant, durable, wear resistant and non slip, easy to use. Specification: Item Type: Thumb Accelerator Material: ABS Handle Diameter: Approx. 22mm/0.9in Linear Definition: Red Positive, Green Signal Line, Black Negative Package List: 1 x Thumb Accelerator 1 x Accessories Note: Please allow some errors due to manual measurement.