Fitment: The E300 throttle kit is compatible with Razor MX350 Version 33+, MX400 Version 33+, E300 Version 20+, E200 Version 24+ Electric Scooter, SX350 McGrath Dirt Rocket Bike, RSF350 Electric Sport Motor Bike, and Pocket Mod Scooters Version 45+ (Chrissy, Sweet Pea, Vapor, Bella, Betty, Blossom, Miniature Euro, Daisy, Kiki, Bellezza).Notice: without indicator lights Single Speed Throttle: This MX350 throttle kit precisely regulates the motor's power output based on your throttle input, enabling quick acceleration and giving you better control for riding in different road conditions. Handlebar Grips Size: Left handlebar grips size-length: 11cm/4.33'', width: 4cm/1.57'', installation diameter: 22mm (7/8''). Right handlebar grips size-length: 6.4cm/2.52'', width: 4cm/1.57'', installation diameter: 22mm (7/8''). Plug and Play: The MX400 throttle is 52.36 inches(133cm) in length and features a 4-pin connector, allowing for plug-and-play. It fits 22mm 7/8" handlebar grips Easy Installation: This pocket mod throttle is a direct replacement for Razor 24 Volt Pocket Mod scooter. Just pay attention to the positive and negative poles during installation, and you can easily complete the installation without too many tools Note: The model number is W13113601043. The model version can be determined based on the product ID code on your product. You can find the product ID code on the battery cover or the bottom of the frame. The 7th and 8th numbers in your product ID code are the version number of your product (eg, "01" = Version 1, "02" = Version 2, etc) Fitment: The E300 throttle kit is compatible with Razor MX350 Version 33+, MX400 Version 33+, E300 Version 20+, E200 Version 24+ Electric Scooter, SX350 McGrath Dirt Rocket Bike, RSF350 Electric Sport Motor Bike, and Pocket Mod Scooters Version 45+ (Chrissy, Sweet Pea, Vapor, Bella, Betty, Blossom, Miniature Euro, Daisy, Kiki, Bellezza).