Electronic vehicle interacts with Go! Go! Smart Wheels playsets Light-up driver button activates fun phrases, music and sounds Perfectly sized for little hands Teaches letter D, vehicle name and pretend play Playful sounds and three sing-along songs keep children engaged Get to work learning and laughing at the construction site with VTech's Go! Go! Smart Wheels Dump Truck. Your little learner can load and unload the Dump Truck for role-play fun! Your child can also learn the letter "D" and the name of the vehicle through pretend play. The Dump Truck responds to SmartPoint locations with different sing-along songs, melodies, sounds and phrases. The Dump Truck works with Go! Go! Smart Wheels and Go! Go! Smart Animals playsets (each sold separately).