Razor Reset Button with Wire for the following models: E100, V8+ E125, V8+ E150, V1+ E175, V19+ E Spark, V1+ ** NOTE: Razor versions can be determined by locating your bar code ID on the battery cover and/or on the bottom of the scooter/bike frame or underside of the unit. 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.