Buyers should prioritize sensor technology, specifically Infrared (IR) or Microwave sensors, with an adjustable detection range (typically 30-80cm). Ensure the valve body is made of low-lead brass or high-grade stainless steel to prevent corrosion. For power supply, look for dual-mode options (AC 110-240V and DC 6V) to ensure functionality during power outages. Additionally, a water-saving logic (e.g., dual-stage flushing: 2 seconds when a user approaches and 4-6 seconds after leaving) is essential for commercial efficiency.