Thunder Tiger K-Rock MT4 G5 ESS-TT Engine Sound System Box Speaker Amp USB ESS-TT Engine Sound System for the Thunder Tiger 1/8 MT4 K-Rock G5 Brushless (Model 6406-F111 & F112) This product is NEW in OEM Packaging and is from a New, Unused Thunder Tiger 1/8 MT4 K-Rock G5 Brushless (Model 6406-F111 & F112) Due to disassembled nature of this product, some parts may show slight signs of disassembly. The parts included with this product are exclusive to what is pictured. See product description for exact contents. Part Number(s) associated with this product (see product description for inclusion details 6406-F111 F112 8069-1