15 minutes to install "plug-in" +5 speed booster kit for the Razor MX500, MX650, SX650, RSF650, E300, Pocket Mod and Quad. This wire adapter allows you to add a 6 or 7 cell "nimh" 3500mah to 5300mah r/c battery with Tamiya connector into the circuit for added acceleration and top speed. 4 to 6 mph boost. Use with caution and with all safety riding gear especially lighter younger riders as they are reaching 25+ mph