Buyers should prioritize SLAM (Simultaneous Localization and Mapping) technology, specifically Lidar-based or Visual SLAM, to ensure precise navigation in complex urban environments. Key performance metrics include battery endurance (minimum 6-8 hours), dustbin capacity (liters/gallons), and cleaning efficiency (square meters per hour). Additionally, ensure the robot features IPX6 or higher waterproof ratings for all-weather outdoor operation and obstacle avoidance sensors (ultrasonic and infrared) to ensure pedestrian safety.