HPI Racing 107012 Trophy 3.5 Buggy RTR 2.4 GHz radio system for crystal-free, comfortable control Waterproof receiver/battery box protects battery and receiver from the elements Strong and reliable nitro star F3.5 engine with 2.5HP 4mm 6061 aluminum chassis has angled sides for extra stiffness Thick 6061 aluminum shock towers are strong and durable