Hot Selling Smart Bluetooth Tracking/ Obstacle Avoidance Robot Car for Steam Edution. Comprehensive Kit Contents: Includes motors, sensors, Arduino board, battery, charger, and all necessary accessories for assembly. Dual Quality Verification: All goods undergo double verification by FUT quality inspection center before shipping. Low Repair Rate: Less than 1% repairing rate within one year ensures high reliability. Fast Delivery: Normally 1-5 workdays after payment with rich stock to satisfy urgent requirements. Immediate Replacement: Free replacement for defective items within 1-3 months of receipt. Full Refund Policy: Full payment refund available if products do not meet customer demand. OEM and ODM Services: Professional R&D center available to develop and manufacture according to customer requirements. Custom Logo Printing: Custom packaging and logo printing services are available upon request.