ApplicationThis Thumb Throttle Is Suitable For Most E-Bikes With Hall Sensor Controller. Works With Any Voltage (24V 36V 48V 60V 72V Etc.) We Are Responsible For Store Products. If You Have Any Questions About Product Quality, Please Contact Us In Time, We Will Do Our Best To Get Back To You Within 24 Hours. Working PrincipleThe Governor Speed Control Method Is A Method Speed Control. In The Series-Excited Motor Speed Control Circuit, Current Flows Through The Regulator Contacts. When The Motor Is Running, The Governor Contacts Open And Close Quickly Based On The Natural Vibration Frequency Of The Moving Contacts. Professional ManufacturingThe Stable Thumb Oil Has Been Carefully Designed And Tested . The Original Factory Specifications Are Complete, The Seams Are Tight, The Original Mold Is Made, No Need To Remove The Thread, The Standard Size, Strict Quality Control. Quality MaterialsThe High Quality Thumb Throttle Speed Controller Is Made From High Quality Plastic And Metal. It Is Durable, Malleable, Resistant To Deformation And Breakage, Reliable In Performance And Long In Service Life. >After-Sales ServiceWhen You First Receive Our Products, If You Have Any Questions About The Products, Please Contact Us By Email And We Will Solve Them As Soon As Possible. At The Same Time, If You Have Any Questions Or Suggestions About Our Products, You Are Also Welcome To Contact Us By Email At Any Time To Provide Customers With Good Service. It Will Always Be Our First Step.