Please read the Redcat repiar and FAQ post before you startup your new cars. There are many posts here on this forum that answer alot of questions. Welcome to the forum. Use the search button up at the top right of the page and search the Redcat forum for answers to commonly asked questions. Here's a link to the FAQ[link]http://www.rcuniverse.com/forum/m_4207842/tm.htm[/link]