Check the listing for details. Razor E300 E200 Dirt Quad Pocket Mod Variable Speed Kit Chrome Throttle Upgrade. Condition: New. Listed at 27.27 USD. TAKE NOTE-----If your buying this you MUST already have our custom kit installed onto your scooter it will say Fast scooters on the controller. If you do not verify you have our kit and read off the writting on the back of your existing controller (send that info with message to seller at checkout) or your order WILL be canceled. Too many people buying this trying to make it work with stock razor controllers and it frys the controller and throttle! Works with all voltages of our variable speed kits as this reads 24v-80v.. PLEASE READ EVERYTHING -Only works in conjunction with our variable speed kits! You can not just ad this to a stock non variable speed scooter,it will not work! This is a sweet looking ad on to our existing Variable Speed Kits..If you had our throttle with key then this plugs right in just like it does now on any version of any razor as long as you have my kit already.. If you want to ad this and you had our variable speed kit with a standard throttle with no key then this only works on the 2 wire versions which you would have had a red and blue spade wires coming out of our variable speed kit controller going directly to the on off switch..If you had the 3 wire setup then this will not work if you had the standard throttle without key.. Not sure,just call..On the back of your controller it should say key or 2 wire,,if it says either key or 2 wire or both your good. This is a very durable throttle with a built in key and digital readout for EXACT voltage which is a must for lipo/lithium battery users and people looking to know exact voltage your batteries are putting out..Comes with matching grip also. It is Chrome over aluminum and looks sweet on any color scooter. Please take note--if your existing variable speed kit did'nt have a key,,you must include a note at checkout stating you did'nt have a key and its a 2 wire..