The Programmable Robot Kit lets you build and control a variety of intelligent machines similar to the ones that perform everyday tasks. Simply download the free app and follow the instructions to build tracker bot, bulldozer, fire truck, conveyor belt and more. Features 197 pieces including tank tracks, motor and ultrasound sensor. App compatible with iPhone/iPad (iOS 10.3 or later) and Galaxy/Android (OS varies by device). Requires 3 AA batteries. Ages 8+.