Check the listing for details. Razor MX500 MX650 48 Volt EcoSmart Metro Throttle & Controller Overvolt Kit. Condition: New. Listed at 58.99 USD. Will not fit the new HD eco smart with the hub motors these fits brushed motors only! Please take note we have all the different throttles available pictured above, it comes standard with the throttle in main picture, if you want ANY other throttle you must send a note to seller at checkout and then slick 'AD" after you type it or it dont get sent with order..simply include the # in the picture of the throttle you see! This is a overvolt kit that MUST be ran in 48 Volts only meaning you will need to ad another battery to run this and a 48volt charger to charge it and neither come with this kit,,it will only run in 48 volts,minimum voltage/low voltage cut off is 41.5..We sell a plug n play charger for this kit when installed also - eBay item number: 322690569798