Revised to Beware of the mars rover kit!
I started the build of the mars rover ultimate only to find out that many parts were not from this kit(too big) or they were not in the kit at all. Customer service after many exchanges of emails all the tech would say that she would forward each time to the packing department,so far no response. Customer service sucks! Luckily I bought it through PayPal and opened a dispute with them and they are pursuing them for a refund. Beware!!! UPDATE! After the back and forth with the company they made it good by sending me a whole new unit pluse updated servos and and a game. After looking through the new u it I still feel that the plug and receptical to thd speaker still was not connect but still they conducted Inwood faith with the replacement unit and upgrades so I revised my stars.