After connecting the LEGO Mindstorms EV3 brick, buttons will control the engines. AB, BC, CD: Select engines. Sense Mode: Push and releaese button handling; Smart Turn with red button. Reverse: All engines will be inverted. Requirements: Min. Android 2. 1. LEGO Mindstorms EV3. Bluetooth. Ports A, B, C and D. No EV3 program required. A previous Bluetooth Pairing is required.