Universal Parts 36v, 4 wire variable speed throttle for Razor EcoSmart Metro HD and EcoSmart SUP electric scooters (all versions). **NOTE: Versions can be determined by locating your bar code ID on the bottom of the vehicle. The 7th and 8th digit in the series will tell you the version of your product: 01=version 1; 02=version 2; 09=version 9, and so on.